[FIXED] Why I can't login wordpress admin dashboard regularly?

Issue

I had built wordpress site on Sakura server. But I can't login admin page regularly. At that time, I have to backup all the source code via FTP, but I want to know why error occur. When I visit wp-admin, there is 404 error and 'jQuery is not defined' error. If you have any solutions, please teach me.

Solution

I think its a server problem or please find out theme or plugins folder for any useless code.

Answered By - Md. Shahinur Islam

Answer Checked By - Pedro (PHPFixing Volunteer)