TKinter CSV file with common header

Question

Anybody know this error

Traceback(most recent call last): 
    File"/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/tkint __init__.py", line 1883, 
        in __call__ return self.func(*args) 
    File "projtk.py", 
        line 125, in action dict_writer.writerow({File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/csv.py", 
        line 154, in writerow returnself.writer.writerow(self._dict_to_list(rowdict)) 
    File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/csv.py", 
        line 149, in _dict_to_list raise ValueError("dict contains fields not in fieldnames: " 
    ValueError: dict contains fields not in fieldnames: 'user Age', 'userName', 'user Email Address'}