When Attribute Error: Can't get attribute'class name' on <module'__main__' (built-in)> appears when loading python pickle

When loading python pickle

AttributeError: Can't get attribute 'name of the class' on <module '__main__' (built-in)>

If you see, in the file that describes this load target class

if __name__ == "__main__":
     hogehoge

It may work if you delete the part described as, write the pickle again, and read it.

If you just delete the above part, it probably won't work.