Mongodb with Nodejs says Unexpected token

I'm using Mongodb with Nodejs to create a little Blog on C9 ide. i have this problem

it's working fine on my localhost

but when i uploaded it on c9 it has this problem

it says

     /home/ubuntu/workspace/node_modules/mongolass/lib/query.js:54
            this[plugin.name] = (...args) => {
                                 ^^^

can anyone help me?

via Wail Skanderi