Best guess, is that previously you didn’t update AMP correctly, and are running into an issue after rebooting.
Make sure your CLI tools are up to date:
https://discourse.cubecoders.com/t/how-to-update-amp-to-the-latest-version/2297
Then from there, if things are still weird, you can copy+restore one of the instance.json-xxx.bak files inside the AMP datastore and rename it to instances.json.
After that, run ampinstmgr fixperms and reboot, then things should be cookin again.