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The extension object '{0}' cannot be declared. Another extension for target '{1}' or the target itself is already declared in this module.
How to fix this diagnostic?
This error means you can't declare this extension object because another extension for the same target (or the target object itself) is already declared in this extension.
To fix it:
- Remove or merge duplicate
tableextension,pageextension, or other extension objects that target the same object. - If the target object is also declared in your extension, rename or remove one of the objects so the target and extension don't overlap.