“406 Not Acceptable” appearing in SEMrush index audit for WordPress site — how do I identify and fix the cause?

“406 Not Acceptable” appearing in SEMrush index audit for WordPress site — how do I identify and fix the cause?

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