求救：freebsd下运行mrtg，报错，如何解决？

www#mrtg online.cfgCan't exec "/usr/local/etc/mrtg/mrtg-online": Permission denied at /usr/local/bin/mrtg line 2170.2013-12-01 23:50:33: WARNING: Running '/usr/local/etc/mrtg/mrtg-online': Permission denied2013-12-01 23:50:33: WARNING: Could not get any data from external command '/usr/local/etc/mrtg/mrtg-online'Maybe the external command did not even start. (Permission denied)2013-12-01 23:50:33: WARNING: Problem with External get '/usr/local/etc/mrtg/mrtg-online':   Expected a Number for 'in' but nothing'2013-12-01 23:50:33: WARNING: Problem with External get '/usr/local/etc/mrtg/mrtg-online':   Expected a Number for 'out' but nothing'2013-12-01 23:50:33: ERROR: Target[online][_IN_] ' $target->[0]{$mode} ' did not eval into defined data2013-12-01 23:50:33: ERROR: Target[online][_OUT_] ' $target->[0]{$mode} ' did not eval into defined dataUse of uninitialized value $inlast in pattern match (m//) at /usr/local/bin/mrtg line 1044.Use of uninitialized value $outlast in pattern match (m//) at /usr/local/bin/mrtg line 1047.--------------其中mrtg-online文件为-----#! /usr/local/bin/php -q请大侠出招相救啊！