Conflict with feed wordpress

FWP 2012.1218 activates without errors on my development setup. That may mean that the fix for this issue resolves it, which you can try too:

https://code.google.com/p/wordpress-geo-mashup/issues/detail?id=627

thanks for the quick response, i replaced the php file with the new however is am now getting an @http Error 500 (Internal Server Error): An unexpected condition was encountered while the server was attempting to fulfill the request’

any chance you can get the error message from your PHP error log?