About: http://webisa.webdatacommons.org/390875965

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	Terence, I would need more information here about the types in play and their definitions to know what the problem really is, but this error is basically telling you that it could not convert dbItem to Bar.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com