Not able to show the add_menu_page icon

You have added the directory name where do you have stored the icon and this should be the 6th argument rather than 5th.

add_menu_page(
    'pms_rohitashv',
    'PMS',
    'subscriber',
    'pms_rohitashv-main',
    '', 
    plugin_dir_url( __FILE__ ).'/images/icon.png'
);

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