Getting error of unexpected output during activation

Even if you get that error, your plugin should still work.

The problem seems to be in lordlinus-business-hours.php, you need to delete line 10 and line 11:

?>
<?php

That outputs a new line that could cause trouble 🙂

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