Hi,
it seems you need to add this at the end of .htaccess file:

This message means your PHP thread has consumed all memory available as configured in your PHP. You could increase this value in php.ini, but usually 256 Mb of memory (as in your case) should be enough. I suggest you to check if there's something strange. Consider that ReDJ itself just execute a single query, so it cannot be this the reason for the memory issue.

I'm assuming your web server is Apache. In this case you should have a .htaccess file in the web root folder. Consider that the file is hidden (start with dot). If you doesn't have it, you could rename htaccess.txt into .htaccess, and add the line at the end.