'NoneType' object has no attribute '_next_stid'

This error occurs when you try to access an attribute or method from a NoneType object, which means that the object does not exist. The specific attribute "_next_stid" is not available in this case.

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'NoneType' object has no attribute '_next_stid'
In Python, the 'NoneType' object has no attribute '_next_stid' error refers to a situation where the program tries to access an attribute or a method of an object that does not exist. This error specifically occurs when the program is attempting to access the _next_stid attribute of a NoneType object.