SyntaxError? Unexpected end of JSON input

I am having the following error while trying to convert mendeley citations to paperpile citations (in word for mac)
Does anybody have a solution?
SyntaxError: Unexpected end of JSON input
at JSON.parse ()
at DocProcessor_DocProcessor.receiveJson (/Applications/
at DocProcessor_DocProcessor.handleRequest (/Applications/
at /Applications/
at s. (/Applications/
at s.emit (events.js:210:5)
at s.EventEmitter.emit (domain.js:476:20)
at s.onclosetag (/Applications/
at E (/Applications/
at T (/Applications/
at N (/Applications/
at s.write (/Applications/
at s.parseString (/Applications/
at s.parseString (/Applications/
at IncomingMessage. (/Applications/
at IncomingMessage.emit (events.js:215:7)
at IncomingMessage.EventEmitter.emit (domain.js:476:20)