问题描述
这里颇为新颖的rails开发人员。我试图在Heroku上有效地部署我的rails应用程序时遇到了此错误消息。我的猜测是JS资源预编译时会遇到一些语法错误。我发现了一个类似的问题，但它似乎仍然没有解决，我已经尝试了所有的建议。
任何帮助表示赞赏。这里是我的问题的命令行跟踪：
$ b $ pre $ ExecJS :: RuntimeError：SyntaxError：意外的标记：运算符（>）（行（/ tmp / execjs20161001-3-1oidjycjs：3623：11948）
at js_error（/ tmp：22342，col：24，pos：826182）
在新JS_Parse_Error处出错
/ execjs20161001-3-1oidjycjs：3623：12167）
at croak（/ tmp / execjs20161001-3-1oidjycjs：3623：22038）
at token_error（/ tmp / execjs20161001-3-1oidjycjs：3623：22175 ）
at unexpected（/ tmp / execjs20161001-3-1oidjycjs：3623：22263）
at expr_atom（/ tmp / execjs20161001-3-1oidjycjs：3623：31244）
at maybe_unary（/ tmp / execjs20161001-3-1oidjycjs：3624：1752）
at expr_ops（/ tmp / execjs20161001-3-1oidjycjs：3624：2523）
at maybe_conditional（/ tmp / execjs20161001-3-1oidjycjs：3624：2615 ）
at maybe_assign（/ tmp / execjs20161001-3-1oidjycjs：3624：3058）
at maybe_assign（/ tmp / execjs20161001-3-1oidjycjs：3624：3232）
表达式（/ tmp / execjs20161001-3-1oidjy
at expr_list（/ tmp / execjs20161001-3-1oidjycjs：3623：31548）
在下标（/ tmp / execjs20161001-3-1oidjycjs：3624：1461）
js_error（（execjs）：3623：12167）
croak（（execjs）：3623：22038）
token_error（（execjs）：3623 ：
unexpected_（（execjs）：3623：22263）
expr_ops（（execjs）：3623：31244）
maybe_unary（（execjs）：3624：1752）
expr_ops （（execjs）：3624：2523）
maybe_conditional（（execjs）：3624：2615）
maybe_assign（（execjs）：3624：3058）
maybe_assign（（execjs）：3624：3232 ）
表达式（（execjs）：3624：3384）
expr_list（（execjs）：3623：31548）
下标（（execjs）：3624：1461）
/ app / vendor / bundle / ruby / 2.2.0 / gems / execjs-2.7.0 / lib / execjs / external_runtime.rb：39：在`exec'
/app/vendor/bundle/ruby/2.2.0/gems /execjs-2.7.0/lib/execjs/external_runtime.rb:21:in`eval'
/app/vendor/bundle/ruby/2.2.0/gems/execjs-2.7.0/lib/execjs/ external_runtime.rb：46：在`call'
/ app / vendor / bu ndle / ruby / 2.2.0 / gems / uglifier-3.0.2 / lib / uglifier.rb：181：在`run_uglifyjs'
/app/vendor/bundle/ruby/2.2.0/gems/uglifier-3.0 .2 / lib / uglifier.rb：143：在`compile'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/uglifier_compressor.rb:52：在`call'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/uglifier_compressor.rb:28:in`call'
/ app / vendor / bundle / ruby / 2.2.0 / gems / sprockets-3.7.0 / lib / sprockets / processor_utils.rb：75：在`call_processor'
/app/vendor/bundle/ruby/2.2.0/gems /sprockets-3.7.0/lib/sprockets/processor_utils.rb:57:in`block in call_processors'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/ sprockets / processor_utils.rb：56：in`reverse_each'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:56:in`call_processors '
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:134:in`load_from_unloaded'
/ app / vendor / bundle /ruby/2.2.0/gems/spr ocket-3.7.0 / lib / sprockets / loader.rb：60：在`block in load'中
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets /loader.rb:317:in`fetch_asset_from_dependency_cache'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:44:in`load'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/cached_environment.rb:20:in`block in initialize'
/ app / vendor / bundle / ruby / 2.2.0 / gems / sprockets-3.7.0 / lib / sprockets / cached_environment.rb：47：在'yield'中
/app/vendor/bundle/ruby/2.2.0/gems/sprockets -3.7.0 / lib / sprockets / cached_environment.rb：47：在`load'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/base。 rb：66：在`find_asset'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/base.rb:73:in`find_all_linked_assets'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/manifest.rb:142:in`block in find'
/ app / vendor / bundle / ruby /2.2.0/gems/sprockets-3.7.0/lib/sproc kets / legacy.rb：114：在逻辑路径'block（2 levels）'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb ：228：在`block in stat_tree'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:212:in`block in stat_directory'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:209:in`each'
/ app / vendor / bundle / ruby / 2.2.0 / gems / sprockets-3.7.0 / lib / sprockets / path_utils.rb：209：在`stat_directory'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7 .0 / lib / sprockets / path_utils.rb：227：在`stat_tree'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb： 105：在`each'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:105:in`block in logical_paths'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:104:in`each'
/app/vendor/bundle/ruby/2.2 0.0 /宝石/链轮-3.7.0 / LIB /链轮/ legacy.rb：104：在`logical_paths'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/manifest.rb:140:in`find'
/ app / vendor /bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/railtie.rb:50:in`each'
/app/vendor/bundle/ruby/2.2.0/ gems / sprockets-rails-3.2.0 / lib / sprockets / railtie.rb：50：在`map'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0 /lib/sprockets/railtie.rb:50:in`precompiled_assets'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/railtie.rb： 35：在`asset_precompiled？'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/railtie.rb:251:in`block（3 levels ）在< class：Railtie>'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/helper.rb:359:in`调用'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/helper.rb:359:in`预编译？'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/he lper.rb：363：在`raise_unless_precompiled_asset'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/helper.rb:337:in `digest_path'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/helper.rb:325:in`asset_path'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/helper.rb:102:in`block in resolve_asset_path'
/ app / vendor / bundle / ruby / 2.2.0 / gems / sprockets-rails-3.2.0 / lib / sprockets / rails / helper.rb：242：在`block in resolve_asset'
/app/vendor/bundle/ruby/2.2 .0 / gems / sprockets-rails-3.2.0 / lib / sprockets / rails / helper.rb：241：在`each'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets- rails-3.2.0 / lib / sprockets / rails / helper.rb：241：在`detect'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib /sprockets/rails/helper.rb:241:in`resolve_asset'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/helper。 rb：101：在'resolve_asset_path'
/ a中pp / vendor / bundle / ruby / 2.2.0 / gems / sprockets-rails-3.2.0 / lib / sprockets / rails / helper.rb：79：在`compute_asset_path'
/ app / vendor / bundle / ruby /2.2.0/gems/actionview-5.0.0.1/lib/action_view/helpers/asset_url_helper.rb:144:in'asset_path'
/app/app/models/group.rb:11:in`< class：Group>'
/app/app/models/group.rb:1:in`< top（required）>'
/app/vendor/bundle/ruby/2.2.0/ gems / activesupport-5.0.0.1 / lib / active_support / dependencies.rb：293：在'require'中
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support /dependencies.rb:293:in'block in require'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:259:in` load_dependency'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in`require'
/ app / vendor / bundle / ruby / 2.2.0 / gems / activesupport-5.0.0.1 / lib / active_support / dependencies.rb：380：在`block in require_or_load'
/ app / vendor / bundle / r uby / 2.2.0 / gems / activesupport-5.0.0.1 / lib / active_support / dependencies.rb：37：在`block in load_interlock'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport -5.0.0.1 / lib / active_support / dependencies / interlock.rb：12：在`block in loading'中
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/ active_support / concurrency / share_lock.rb：117：在'exclusive'中
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies/interlock.rb:11 ：在`loading'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:37:in'load_interlock'
/ app /vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:358:in`require_or_load'
/app/vendor/bundle/ruby/2.2.0/ gems / activesupport-5.0.0.1 / lib / active_support / dependencies.rb：511：在`load_missing_constant'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support /dependencies.rb:203:in' const_missing'
/ app /db/seeds.rb:7:in`< top（required）>'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies .rb：287：在`load'中
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:287:in`block in load'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:259:in`load_dependency'
/ app / vendor / bundle / ruby / 2.2.0 / gems / activesupport-5.0.0.1 / lib / active_support / dependencies.rb：287：在`load'中
/app/vendor/bundle/ruby/2.2.0/gems/railties-5.0 .0.1 / lib / rails / engine.rb：549：在`load_seed'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/tasks/database_tasks。 rb：268：在`load_seed'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/railties/databases.rake:196:in`block（2水平）in< top（required）>'
/app/vendor/bundle/ruby/2.2.0/gems/rake-11.3.0/exe/rake:27:in`< top（必填项）>'
任务：TOP => db：seed
（通过使用-trace运行任务来查看完整跟踪）
我有同样的问题，结果证明我正在使用ES6箭头函数。问题是，我的生产环境使用的Sprockets版本与ES6不兼容。
当时我的解决方案是删除箭头函数。另一种方法是使用或其中一个。
Fairly new rails developer here. I am running into this error message while trying to effectively deploy my rails app on Heroku. My guess is that some syntactical error is being run into when the JS assets precompile.
I found a similar issue here on SO, but it seems that it is still unresolved and I have attempted all of the suggestions in the responses.
Any help is appreciated. Here's the command line trace of my issue:
ExecJS::RuntimeError: SyntaxError: Unexpected token: operator (>) (line: 22342, col: 24, pos: 826182)
Error
at new JS_Parse_Error (/tmp/execjs20161001-3-1oidjycjs:3623:11948)
at js_error (/tmp/execjs20161001-3-1oidjycjs:3623:12167)
at croak (/tmp/execjs20161001-3-1oidjycjs:3623:22038)
at token_error (/tmp/execjs20161001-3-1oidjycjs:3623:22175)
at unexpected (/tmp/execjs20161001-3-1oidjycjs:3623:22263)
at expr_atom (/tmp/execjs20161001-3-1oidjycjs:3623:31244)
at maybe_unary (/tmp/execjs20161001-3-1oidjycjs:3624:1752)
at expr_ops (/tmp/execjs20161001-3-1oidjycjs:3624:2523)
at maybe_conditional (/tmp/execjs20161001-3-1oidjycjs:3624:2615)
at maybe_assign (/tmp/execjs20161001-3-1oidjycjs:3624:3058)
at maybe_assign (/tmp/execjs20161001-3-1oidjycjs:3624:3232)
at expression (/tmp/execjs20161001-3-1oidjycjs:3624:3384)
at expr_list (/tmp/execjs20161001-3-1oidjycjs:3623:31548)
at subscripts (/tmp/execjs20161001-3-1oidjycjs:3624:1461)
new JS_Parse_Error ((execjs):3623:11948)
js_error ((execjs):3623:12167)
croak ((execjs):3623:22038)
token_error ((execjs):3623:22175)
unexpected ((execjs):3623:22263)
expr_atom ((execjs):3623:31244)
maybe_unary ((execjs):3624:1752)
expr_ops ((execjs):3624:2523)
maybe_conditional ((execjs):3624:2615)
maybe_assign ((execjs):3624:3058)
maybe_assign ((execjs):3624:3232)
expression ((execjs):3624:3384)
expr_list ((execjs):3623:31548)
subscripts ((execjs):3624:1461)
/app/vendor/bundle/ruby/2.2.0/gems/execjs-2.7.0/lib/execjs/external_runtime.rb:39:in `exec'
/app/vendor/bundle/ruby/2.2.0/gems/execjs-2.7.0/lib/execjs/external_runtime.rb:21:in `eval'
/app/vendor/bundle/ruby/2.2.0/gems/execjs-2.7.0/lib/execjs/external_runtime.rb:46:in `call'
/app/vendor/bundle/ruby/2.2.0/gems/uglifier-3.0.2/lib/uglifier.rb:181:in `run_uglifyjs'
/app/vendor/bundle/ruby/2.2.0/gems/uglifier-3.0.2/lib/uglifier.rb:143:in `compile'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/uglifier_compressor.rb:52:in `call'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/uglifier_compressor.rb:28:in `call'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:75:in `call_processor'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:57:in `block in call_processors'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:56:in `reverse_each'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:56:in `call_processors'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:134:in `load_from_unloaded'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:60:in `block in load'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:44:in `load'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/cached_environment.rb:20:in `block in initialize'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/cached_environment.rb:47:in `yield'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/cached_environment.rb:47:in `load'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/base.rb:66:in `find_asset'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/base.rb:73:in `find_all_linked_assets'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/manifest.rb:142:in `block in find'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:114:in `block (2 levels) in logical_paths'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:228:in `block in stat_tree'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:212:in `block in stat_directory'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:209:in `each'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:209:in `stat_directory'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:227:in `stat_tree'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:105:in `each'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:105:in `block in logical_paths'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:104:in `each'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:104:in `logical_paths'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/manifest.rb:140:in `find'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/railtie.rb:50:in `each'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/railtie.rb:50:in `map'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/railtie.rb:50:in `precompiled_assets'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/railtie.rb:35:in `asset_precompiled?'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/railtie.rb:251:in `block (3 levels) in <class:Railtie>'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/helper.rb:359:in `call'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/helper.rb:359:in `precompiled?'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/helper.rb:363:in `raise_unless_precompiled_asset'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/helper.rb:337:in `digest_path'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/helper.rb:325:in `asset_path'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/helper.rb:102:in `block in resolve_asset_path'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/helper.rb:242:in `block in resolve_asset'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/helper.rb:241:in `each'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/helper.rb:241:in `detect'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/helper.rb:241:in `resolve_asset'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/helper.rb:101:in `resolve_asset_path'
/app/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/helper.rb:79:in `compute_asset_path'
/app/vendor/bundle/ruby/2.2.0/gems/actionview-5.0.0.1/lib/action_view/helpers/asset_url_helper.rb:144:in `asset_path'
/app/app/models/group.rb:11:in `<class:Group>'
/app/app/models/group.rb:1:in `<top (required)>'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `require'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `block in require'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `require'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:380:in `block in require_or_load'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:37:in `block in load_interlock'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies/interlock.rb:12:in `block in loading'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/concurrency/share_lock.rb:117:in `exclusive'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies/interlock.rb:11:in `loading'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:37:in `load_interlock'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:358:in `require_or_load'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:511:in `load_missing_constant'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:203:in `const_missing'
/app/db/seeds.rb:7:in `<top (required)>'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:287:in `load'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:287:in `block in load'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:287:in `load'
/app/vendor/bundle/ruby/2.2.0/gems/railties-5.0.0.1/lib/rails/engine.rb:549:in `load_seed'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/tasks/database_tasks.rb:268:in `load_seed'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/railties/databases.rake:196:in `block (2 levels) in <top (required)>'
/app/vendor/bundle/ruby/2.2.0/gems/rake-11.3.0/exe/rake:27:in `<top (required)>'
Tasks: TOP => db:seed
(See full trace by running task with --trace)
I had this same problem, and it turned out I was using an ES6 arrow function. The problem was, the version of Sprockets my production environment was using was not compatible with ES6 yet.
My solution at the time was to remove the arrow function. The alternative is to use something like sprockets-es6 or one of the beta version of sprockets.
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