Call to a member function add_rewrite_tag() on null

While I don’t like taking credit for someone else’s answer, I also don’t like leaving a question without answer when the answer does exist and it’s already been given.
I hope Milo won’t mind if I copy the answer from his comment.

The register_taxonomy calls should be hooked to init.

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