How to correct what is written below: Exception in Tkinter callback Traceback (most recent call last): File "C:\Users\Dani Brothers\Anaconda3\lib\tkinter\__init__.py", line 1705, in __call__ return self.func(*args) File "D:/Python/Book Bank/New folder/PyCharm/Final/Excel.py", line 57, in SaveBook e_pissue.get(), AttributeError: 'NoneType' object has no attribute 'get'
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