“Cannot modify header information” warning?

Have you tried turning off errors / warnings on your Server? Maybe no per WP_DEBUG, but rather some setting on your Servers admin interface.

Many times I encountered this error, it was caused by a Warning of some plugin.

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