There has been a critical error on your website – won’t fix no matter what

So I reinstalled WordPress on both my live and local environments and downgraded to version 5.4.2 and everything seems to be working just fine, so far.

I’ll update if anything breaks again.

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