Had a user in IRC earlier report that their app had an "Unhandled error". Here is the gist of their error. It seems that jitsu is trying to write the package.json twice, but not quite sure where it's determining that the version is out of date. Looking in the server logs, the application was never created. The "Unhandled error" is from the application never being created, but jitsu trying to upload a snapshot to the application anyway.