Fixed invalid call of `NSManagedObject.fetchRequest()`
Fixed invalid call of `NSManagedObject.fetchRequest()`

Calling `NSManagedObject.fetchRequest()` is invalid:

> This method is only legal to call on **subclasses of `NSManagedObject`** that represent a single entity in the model.

https://developer.apple.com/documentation/coredata/nsmanagedobject/1640605-fetchrequest

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