PLS-01912: : instance must of be of type string
Cause: The run-time type of the instance is not the declared type. e.g. If the return value of a user defined constructor is wrong.
Action: Return the correct type.
Cause: The run-time type of the instance is not the declared type. e.g. If the return value of a user defined constructor is wrong.
Action: Return the correct type.
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