SoftException in Application.cpp:249: can't acces file

I have a site with news messages. And in my `.htacces` file I have this line of code. ``` RewriteRule ^event/([0-9]+)/?$ events.php?id=$1 ``` If I go to mysite.com/index/event/1 I get an `500 internal server error` The weird thing is that if I change the `.htacces` to ``` RewriteRule ^event/([0-9]+)/?$ nieuws_read.php?id=$1 ``` I don't get that error and the page works correctly. How is it possible that it doesn't work with all files. I got this error ``` [Tue May 27 17:46:41 2014] [error] [client ipadress] SoftException in Application.cpp:249: File "/../../../../public_html/new/events.php" is writeable by group, referer: http://new.mysite.eu/index/events [Tue May 27 17:46:41 2014] [error] [client ipadress] Premature end of script headers: events.php, referer: http://new.mysite.eu/index/events [Tue May 27 17:46:41 2014] [error] [client ipadress] File does not exist: /../../../../public_html/new/500.shtml, referer: http://new.mysite.eu/index/events ``` I hope I gave you enough info. Thx