Mathex319

My friend shared his music bot with me so i could manage it aswell, he has done it with 2 other persons aswell, everytime i wan't to manage it tho it says. "404 error URL not found" so i can't basiclly do anything, my friends that can manage the bot tho got no problems with getting on it, can someone please help me? i would appriciate it, My Regards Mathex319