Can't take screenshots

[alistairmackenzie]

Works well until you try and take a screenshot.

Puush version is R100.

The debug console returns this output.

$ node app.js
/home/notroot/puushproxy/node_modules/mongoose/lib/utils.js:399
throw err;
^
TypeError: undefined is not a function
at fn (/home/notroot/puushproxy/app.js:119:11)
at Promise. (/home/notroot/puushproxy/app.js:177:5)
at Promise. (/home/notroot/puushproxy/node_modules/mongoose/lib/promise.js:120:8)
at Promise.emit (events.js:107:17)
at Promise.emit (/home/notroot/puushproxy/node_modules/mongoose/lib/promise.js:59:38)
at Promise.complete (/home/notroot/puushproxy/node_modules/mongoose/lib/promise.js:70:20)
at /home/notroot/puushproxy/node_modules/mongoose/lib/query.js:898:15
at model.Document.init (/home/notroot/puushproxy/node_modules/mongoose/lib/document.js:183:5)
at model.init (/home/notroot/puushproxy/node_modules/mongoose/lib/model.js:182:36)
at /home/notroot/puushproxy/node_modules/mongoose/lib/query.js:896:12
$