VS Code error: Request textDocument/hover failed

I’m using openHAB extension for VSCode version 0.4. This error message appears in the Output Console every time the mouse pointer hovers over any word:

[Error - 8:23:13 AM] Request textDocument/hover failed.
  Message: Internal error, please look at the server's logs.
  Code: -32603 

I’ve searched for a solution here and the recommendation is to restart OpenHAB. I can confirm that this drastic remedy does work …. for about one editing session and then it promptly returns.

Is there a permanent fix for this?