Invalid Method on class Concrete\\Core\\Attribute\\Category\\FileCategory: get.

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Hello,

When I try to save the properties of a file, with a custom select attribute, that I have uploaded through file manager using a form, that has been set up on the front end, I get the following error:

{"error":{"message":"Invalid Method on class Concrete\\Core\\Attribute\\Category\\FileCategory: get."},"errors":["Invalid Method on class Concrete\\Core\\Attribute\\Category\\FileCategory: get."]}

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