That looks like a filter you used in one of your new notes caused a problem.
Please make a
Backup of just the default Optional Files (no databases) and attach it to a
Support Ticket with a link to this thread so that we can see what causes this and avoid it happening in future.
Once you've done that try removing the last note, or few notes, that you added. If that gets it working again please also tell us in your ticket which note(s) you removed as that will help us narrow down the problem.