[PartyPaint]

First of don't use 000webhost. Those guys have lot of things disabled for "security reasons".

Now coming to your problem, try reuploading style.php to the specified path. If problem persists check if the file chmod settings are set to 644.

Does this problem occur only in admin folder?

Did all what you said, nothing changed and yes it occures
only in admin folder, it's this path: http://******.com/admin/index.php