The expression uses an operation that is not available for operands of the specified types. An operation may be executed for incompatible types or this operation is not supported by one of the operands.
Check types compatibility. If the types are compatible, check if the operation is supported by both types. See the description of the appropriate data types for the list of operations supported by simple types of data. All types inherited from the Object class support the following operations: "<>" and "=".
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