Undefined symbol: OBJC_CLASS$_ADClient The ADClient used in the project has been removed, but Xcode16.1 still reports this error.
As a first step, choose Product > Clean Build Folder and then retry. This could just be something that hasn’t been rebuilt.
If the problem persists, it’s likely that a reference to this symbol still exists somewhere in your code. See Determining Why a Symbol is Referenced for general instructions on how to track that down.
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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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