Hi all, sorry for taking so long to respond.

I’ve looked into this as well and can’t find any reason for why this error
should be popping up. I’ve asked the Nova devs to check things out. I suspect
this may be a regression since I haven’t changed anything between the time the
extension was working and now that it’s not.

Hopefully they’ll get back to me soon so I can update the extension such that
it works again.

-Kristófer R.

Following up on this, this has been confirmed to be an issue in Nova [0]. The 
Nova devs are planning on fixing this when Nova 10 is released, so we’ll just
have to wait for the next release.

[0] https://devforum.nova.app/t/lsp-stops-because-of-an-error-i-dont-understand/1749/3

-Kristófer R.

The problem has been fixed in Nova 10 and the Psalm extension now works as
intended.

-Kristófer R.