Wysiwyg editor not working on 4.2.2

Check .htaccess file if it is blocking with this rule:
#add_header Content-Security-Policy “default-src ‘self’;”;

https://wordpress.org/support/topic/no-visual-edition-is-showing/

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