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[http://www.nga.gov/content/ngaweb/research/casva/research-projects.html A Project of the National Gallery of Art, Center for Advanced Study in the Visual Arts ]
The subject validation returned with a "[2,"smw-datavalue-wikipage-invalid-title","Washington Square %28Philadelphia%2C PA%29%23_15caecf19b4788076e9bdcd9331e99b4"]The page type input value "Washington Square %28Philadelphia%2C PA%29%23_15caecf19b4788076e9bdcd9331e99b4" contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process." error.