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I fixed line 35 but still have errors.

Windows pop-out with these messages:

1st window:
Execution error for 'Delete Hidden Layers':
Error: eval: unbound variable: cadr

2nd window:
Plug-In 'Delete Hidden Layers' left image undo in inconsistent state, closing open undo groups.

Do have any idea?

Thanks in advance.

(I used Windows XP, by the way)