Fatal error for category archives

for make sure about the problems, would you like to show us about the errors by adding below code in your wp-config.php

define( 'WP_DEBUG', true );
define( 'WP_DEBUG_LOG', true );
define( 'WP_DEBUG_DISPLAY', true );

be better if you give web console message to when accessed the error category/url.

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