AttributeError: 'PPStructure' object has no attribute 'layout_predictor'

This error is raised when you are trying to access the `layout_predictor` attribute of a `PPStructure` object, but the object does not have this attribute.

There could be a few reasons why this is happening:

1. The `PPStructure` class does not have a `layout_predictor` attribute. Check the documentation or source code for the class to confirm that this attribute exists.

2. The `PPStructure` object you are trying to access does not have the `layout_predictor` attribute set. Make sure you are initializing the object properly and setting all necessary attributes.

3. There may be a typo in the code, and you are actually trying to access a different attribute that does not exist. Double-check the spelling of the attribute name and make sure it is correct.