Whats is the meaning of this error 500

I changed a few files with the header and footer and then this error
appearing…

Bad character encoding is a very typical cause of 500 server errors.

What text editor did you use to edit the files? Are you using the correct text encoding in the files, i.e. Unicode for a linux server?

If the text encoding is OK and you’re still getting the out of memory error, and that line define('WP_MEMORY_LIMIT', '64M'); doesn’t help, ask your webhost; they will need to increase memory for you.

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