manage_users_custom_columns filter not firing callback functions

I was using the wrong filter name by adding an ‘s’ in manage_users_custom_columns. The correct filter name is without ‘s’ : manage_users_custom_column.
This was pointed out in the comments by @mmm.

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