OperationError public enum OperationError : Error Errors caused by failing operations. alreadyExists An operation to create something was performed when that something already existed. Declaration Swift case alreadyExists missing An operation to remove something was performed when that something didn’t exist. Similar to nil. Declaration Swift case missing © 2019 . All rights reserved. (Last updated: 2019-01-03) Generated by jazzy ♪♫ v0.9.4, a Realm project.