error 500 when editing a campaign

hi thanks

i put it but it just tells me this:

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Apache Server at Port 80
can you show me how you've added the debug line and where in the file? A screenshot will do.
p.S: The above error is from the web server, it doesn't even reach the mailwizz script to execute it ;)
hi, i can see the debug on the other pages.

it must be something about server, because sometimes works and other doesn't