Exception on Vaadin forum page…
That looks like some kind of uncaught error that’s passed from the server to the client. The error message itself isn’t too descriptive on what that might be, but I have a hunch on what might cause that. I’ll look into that, and try to fix it asap.
Refreshing (F5 or Ctrl/Cmd-R) the page should make that message disappear.
Thank you. It happens after I sent letter with question on forum.