So it was a long time I’ve been struggling with some ‘error occurred’ on save, in strapi. But It worked until I needed to do some more customization.
My problem is that whenever i create a new collection type with some fields and press save, the window starts loading and throws multiple ‘error occurred’ at the top of the window, and sometimes it will load just endlessly until manual refresh. After reloading manually they do appear on the screen.

What can cause this behavior?

To save new items inside strapi without errors.

After a few saves my console gets really red with this error: Failed to load resource: net::ERR_CONNECTION_REFUSED

I can confirm this 100% always happens. I have the same setup with Mongo + Strapi. Anytime I make a change to the models, the little error notification on the top center says “error occurred” but if you just give it 10-15seconds or refresh sometimes, you’ll notice it still succeeds. It’s giving a false negative, there is no actual error, at least in my case. Would be nice if it were fixed, but its not preventing me from doing anything

I want to leave a comment for whoever is suffering with this error.

I had same error before a couple of hours.
I found what was cousing the error.