HTTP ERROR 500

[Chrisj]

When I enter my log-in credentials and submit, in my site's web script, I see this:
This page isn’t working...... is currently unable to handle this request.
HTTP ERROR 500
So, I look at dev tools > Console I see:

crbug/1173575, non-JS module files deprecated.
(index):7288

and when I expand the 7288 I see:

"No resource with given URL found"

but if I refresh, I'm logged in.

Any ideas on how to solve this error is appreciated.

[requinix]

A 500 happens on the server, not in the browser. Check server log files for a clue what went wrong.