404 error when i try to search by category or by tag

Try going to your permalinks page within the admin to flush the rewrite rules.
Just be navigating to that page will flush the rules, but you could click save even if you made no changes.

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