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'______' is not a valid value for 'integer'. The value '_____' of element 'ModelNumber' is not valid.

When this Amazon error is returned, it means the value you put in to ModelNumber is not an integer. To resolve, check whether or not you put letters or other characters in that field. It is a common mistake to copy to Model Number exactly how it looks with dashes (i.e. 912-010) but just removing the dash will make it a valid entry.