When you get a network 500 error on your computer or device when visiting a website it means that something internally has gone wrong with the websites server.
It can also mean that the server is too busy to handle the requests and is overloaded.
Or there could be work being done on the server.
If you get a network 500 error it's nothing on your end causing the issue but instead the websites issue.
A server gives the network 500 error when it cannot be more specific as to the actual cause.
The HTTP 500 internal server error is on the web site's server but the server could not be more specific on what the exact cause is.
All you can do to fix the error is to just wait as you can't fix it yourself unless your the server admin.