[Scribble student bugreport] Strange Error when editing Custom Blocks

Strange Error when editing Custom Blocks
Friday, 12 September 2014, 10:22 PM

the error appears when I am editing one of the custom blocks.

I rarely appeared in the last several days, I used to just re-start
scribble and everything is fine. But now it appears regularly, so
kinda annoying. Any tips to fix this?

Is this the program error or something?

[ATTACHMENT - screenshot with details redacted for privacy]