Error: The deserializer has no knowledge of which type to deserialize. Check that the type being serialized has the same contract as the type being deserialized

This issue is caused by a mismatch of DLL files between your SelectHR and SelectPay system.
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This issue can occur following an update to SelectPay (new service pack being applied).
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If you are seeing this error in the audit log of the SelectHR Admin Tool, please raise a new case online and reference the title of this article.