What does error message "500 Server Error - An internal server error occured." mean and how can I solve and fix it.
Newgrounds
*. This problem is from Newgrounds's side and you can't do anything about it, just wait.
*. Even though this is a Newgrounds's problem not yours but you can try disable/enabling your VPN and see if that helps.
*. Newgrounds has banned some countries like some parts of India. So just try a USA or another location in your VPN.