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 . The Nova devs are planning on fixing this when Nova 10 is released, so we’ll just have to wait for the next release.  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.