UnboundLocalError: cannot access local variable 'interimData' where it is not associated with a value

[ReMelon]

Hello. I have this error

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Traceback (most recent call last):
File "C:\Users\user\Desktop\Folder\Coding\GoBooDo-master\GoBooDo.py", line 218, in
book.start()
File "C:\Users\user\Desktop\Folder\Coding\GoBooDo-master\GoBooDo.py", line 176, in start
self.insertIntoPageDict(interimData)
^^^^^^^^^^^
UnboundLocalError: cannot access local variable 'interimData' where it is not associated with a value