This is the error code I got from my testing server:
Warning: require(Block_3.php): failed to open stream: No such file or directory in C:\xampp\htdocs\webassist\email\mailformatting_php.php on line 151
Fatal error: require(): Failed opening required 'Block_3.php' (include_path='.;C:\xampp\php\PEAR') in C:\xampp\htdocs\webassist\email\mailformatting_php.php on line 151
No code is being generated on the remote server - just the 500 error
If I but the Block_3.php in the C:\xampp\php\PEAR folder, there are no errors, but I would have no idea how to do that on the remote server (directory structure is \wwwroot\)