Custom taxonomy auto suggest not working in wordpress admin

Without changing anything, everything seems OK today. The auto-suggest works and suggests me existing tags when I begin to type a word… I don’t know why but maybe there was a problem because I’ve firstly created this custom taxonomy as hierachical before I decided to change it to non-hierarchical.

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