paperclip / rails admin / heroku error

gistfile1.txt

2014-06-16T18:23:15.981170+00:00 heroku[router]: at=info method=GET path="/admin" host=makerlab-akqa.herokuapp.com request_id=dc8fdf7e-670e-4265-abf1-3810ab181bfc fwd="204.90.10.4" dyno=web.1 connect=30ms service=198ms status=200 bytes=2346
2014-06-16T18:23:11.893655+00:00 heroku[router]: at=info method=GET path="/" host=makerlab-akqa.herokuapp.com request_id=880d945d-9ceb-485e-b75e-20e85dd8983f fwd="204.90.10.4" dyno=web.1 connect=1ms service=257ms status=200 bytes=1504
2014-06-16T18:23:17.703857+00:00 heroku[router]: at=info method=GET path="/admin/tool?_pjax=%5Bdata-pjax-container%5D" host=makerlab-akqa.herokuapp.com request_id=60278068-5c84-4970-a981-f0466933f7c9 fwd="204.90.10.4" dyno=web.1 connect=20ms service=138ms status=200 bytes=2598
2014-06-16T18:23:19.542533+00:00 heroku[router]: at=info method=GET path="/admin/tool/new?_pjax=%5Bdata-pjax-container%5D" host=makerlab-akqa.herokuapp.com request_id=aaa06a39-6385-4f14-8a70-c109716ba309 fwd="204.90.10.4" dyno=web.1 connect=2ms service=417ms status=200 bytes=2489
2014-06-16T18:23:31.887075+00:00 heroku[router]: at=info method=POST path="/admin/tool/new" host=makerlab-akqa.herokuapp.com request_id=331d4f8f-68ae-4ab2-ac77-ecd91e33694c fwd="204.90.10.4" dyno=web.1 connect=0ms service=864ms status=500 bytes=1765
2014-06-16T18:24:55.103210+00:00 heroku[router]: at=info method=GET path="/" host=makerlab-akqa.herokuapp.com request_id=34d62da2-ae70-4fea-b603-1a88e652af9b fwd="204.90.10.4" dyno=web.1 connect=3ms service=45ms status=200 bytes=1504
2014-06-16T18:24:59.176899+00:00 heroku[router]: at=info method=GET path="/admin" host=makerlab-akqa.herokuapp.com request_id=ab6a2034-70f8-4c5a-93a3-ee8284f80e70 fwd="204.90.10.4" dyno=web.1 connect=1ms service=101ms status=200 bytes=2346
:2014-06-16T18:33:47.378082+00:00 heroku[router]: at=info method=GET path="/admin" host=makerlab-akqa.herokuapp.com request_id=007fede0-c47e-4511-90b3-db4b78c4b463 fwd="204.90.10.4" dyno=web.1 connect=2ms service=43ms status=200 bytes=2346
2014-06-16T18:33:55.931050+00:00 heroku[router]: at=info method=GET path="/admin" host=makerlab-akqa.herokuapp.com request_id=eb9be733-30c7-4500-9ac4-0a01eb14656f fwd="204.90.10.4" dyno=web.1 connect=0ms service=142ms status=200 bytes=2346
2014-06-16T18:33:56.056991+00:00 heroku[router]: at=info method=GET path="/assets/rails_admin/rails_admin-b80c5bffe76705eb133888491f410620.js" host=makerlab-akqa.herokuapp.com request_id=bb3c2137-a8f5-4eea-b39e-02706aee3dce fwd="204.90.10.4" dyno=web.1 connect=1ms service=4ms status=304 bytes=111