About: http://webisa.webdatacommons.org/66860674

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Since the first thing you returned was an int, it expects your second thing to also be an int.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com