500: Internal Server Error

when entering the "http://prusa1.local/" url (that used to work) i get a 500 internal server error.
Entering the ip on the screen of my prusa mk3 does load the octoprint page and is functional
OctoPrint version : 1.3.12
OctoPi version : 0.14.0

Not that experienced but am able to acces trough ssh from my laptop
Firefox 68.0.1 on mac os 10.12.6

How do i start troubleshooting this ?

Hello @cmulder002!

Have you changed "http://octopi.local/" to "http://prusa1.local/"?
You may try "http://octopi.local/" instead.

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Tried that and that does not work either.
Firefox gives the "We can’t connect to the server at www.octopi.local." error
At least its different then the 500 error so that could indicate some parts are working. (hence it works when the ip is used)
There is a config file where you can change from octopi to in my case prusa1 and since forgot where.

Any suggestions?

Try this:
Enter to the Pi with SSH (Putty).
There you enter raspi-config with:
sudo raspi-config

Goto 2 Network Options -> N1 Hostname -> <Ok>
Then you can see your actual hostname and can change it.

Maybe this can help you too name-resolution guide

And your browser shouldn't be trying to "help" you by prepending www. to the LOCAL hostname.