I keep getting message that an internal error has occurred to quit and open messages again but nothing happens.Im not receiving IM on my Mac

Hello, Transw1973.

Welcome to Apple Support Communities.

From what I've read is that you're getting an error message when trying to use the Messages app on your Mac. I'd like to help. Start with these two articles:

Use Messages with your Mac

If you get an error when trying to activate iMessage or FaceTime

Make sure that you're signed in. The steps found here may also be helpful:

If an app freezes or quits unexpectedly on Mac

Then see if the issue persists in safe mode and test user account:

How to test an issue in another user account on your Mac

Use safe mode to isolate issues with your Mac

"If an issue doesn't happen in safe mode

If an issue doesn't happen when your Mac is started in safe mode, try restarting without pressing any keys.

• If the issue comes back, you might have incompatible login items.
• If the issue doesn't come back, it was probably caused by a cache or directory issue with your startup disk, which safe mode fixed".

Keep me updated.

Cheers!