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From International Robin Hood Bibliography
The subject validation returned with a "[2,"smw-datavalue-wikipage-invalid-title","1845 - Palmer%2C Charles Ferrers - History of Tamworth %282%29"]The page type input value "1845 - Palmer%2C Charles Ferrers - History of Tamworth %282%29" contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process." error.