My Designer project was working fine, I don't even think I made any changes just beforehand, and then all of the sudden if I view one of my components, I get this error. The error is fatal (options are "exit" and "restart"), so I can't even try to fix it: The moment I click on that component, the error occurs. It appears to be coming from a TreePanel.

The code works fine outside of Designer (i.e., the site runs correctly).

Anyone experience this before? I'm using Designer 1.2.2 and ExtJS 4.0.7.