About: http://webisa.webdatacommons.org/423093420

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	The error is related to you examining/treating a variable as though it were simple (string, number, etc) but in fact, the variable is a complex type (object, array, struct, etc).
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com