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The subject validation returned with a "[2,"smw-datavalue-wikipage-invalid-title","User%3AWillRatcliffe%23_9f632c15fcd2db618176f34f2c0214f6"]The page type input value "User%3AWillRatcliffe%23_9f632c15fcd2db618176f34f2c0214f6" contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process." error.