Theme requires allow_url_include = on in php.ini

Okay, first off, that’s an incredibly badly made theme. Your item number 2 there indicates to me that he making AJAX calls in entirely the wrong way.

Secondly, look for anything in the theme that is using http but not in a link. allow_url_include basically lets you include some PHP from a remote site, which is indeed bad, but he might just be using it wrong.

If the theme was freely available, I could look at it and give you more information. Is this theme available for download?

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)