What does the error "AttributeError: 'Textnet' object does not possess the attribute '_matrix'" mean?

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The error message "AttributeError: 'Textnet' object does not possess the attribute 'matrix'" suggests that the 'Textnet' object in the program is missing the 'matrix' attribute. This means that the code is trying to access a particular attribute of the Textnet object, but that attribute does not exist in the object. This could be due to a programming error or a missing import statement.