Syntax Error: Unexpected end of JSON input

[KR1ST3N]

I ran fb-messenger-cli and the output shows this:

Launching app...
undefined:1

SyntaxError: Unexpected end of JSON input
    at JSON.parse (<anonymous>)
    at Request._callback (/usr/local/lib/node_modules/fb-messenger-cli/lib/messenger.js:517:35)
    at Request.self.callback (/usr/local/lib/node_modules/fb-messenger-cli/node_modules/request/request.js:185:22)
    at Request.emit (events.js:310:20)
    at Request.<anonymous> (/usr/local/lib/node_modules/fb-messenger-cli/node_modules/request/request.js:1154:10)
    at Request.emit (events.js:310:20)
    at Gunzip.<anonymous> (/usr/local/lib/node_modules/fb-messenger-cli/node_modules/request/request.js:1076:12)
    at Object.onceWrapper (events.js:416:28)
    at Gunzip.emit (events.js:322:22)
    at endReadableNT (_stream_readable.js:1187:12)

Can anyone help out? Thanks!