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Exception 'NoneType' object has no attribute 'transData'

Traceback (most recent call last): File "C:\Users\ekarni\AppData\Local\Programs\Python\Python39\lib\site-packages\matplotlib\cbook\__init__.py", line 287, in process ...
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AttributeError: 'NoneType' object has no attribute 'transData'

When I click on any of the three points plotted, no label appears and I get this error: Traceback (most recent call last): File "/Users/sbasu1/packages/macports ...