OT code for document type missing

[hjwp]

Trying to run the basic demo example from version 0.6 with the ace editor. Seeing this error in the browser:

bcsocket.js:95
Error: OT code for document type missing
    at t.open (share.js:1)
    at t.<anonymous> (share.js:1)
    at t.e.emit (share.js:1)
    at t.setState (share.js:1)
    at t.socket.onopen (share.js:1)
    at e (bcsocket.js:95)
    at Xd.g.channelOpened (bcsocket.js:95)
    at Ed.f.Rb (bcsocket.js:85)
    at nd (bcsocket.js:63)
    at md (bcsocket.js:58)bcsocket.js:95 ebcsocket.js:95 g.channelOpenedbcsocket.js:85 f.Rbbcsocket.js:63 ndbcsocket.js:58 mdbcsocket.js:56 f.ecbcsocket.js:55 f.Bcbcsocket.js:42 ycbcsocket.js:41 f.dispatchEventbcsocket.js:49 Rcbcsocket.js:48 f.ucbcsocket.js:48 f.Qb

bcsocket.js:81 Uncaught TypeError: Cannot read property 'n' of null