AttributeError: 'NoneType' object has no attribute 'SaveAs'

This error occurs when you try to call the SaveAs method on an object that is None. In other words, the object does not exist or has not been initialized correctly.

To fix this error, you need to make sure that the object you are calling SaveAs on is not None. Check if the object has been initialized correctly and ensure that it is not empty before calling any methods on it.

You can also add a condition to check if the object is None before calling the SaveAs method. For example:

if obj is not None:
obj.SaveAs(filename)

This way, the SaveAs method will only be called if the object is not None.