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"Undefined property" means that the code is trying to access a property or variable that does not exist.

In the given context, it could mean that either the "auth()" function or the "posts()" function is not returning an object that has a "create()" method. It could also mean that the "user()" function is not returning an object with a "posts()" method.

To fix the error, one would need to check that the functions are returning the expected objects and that the objects have the necessary methods.