can't prove via twitter

maybe the fault is in my side, I can't know. the error at the end is display in red. I just need a meaningful message, or know where get info about the error 1002

```
$ keybase prove twitter sniffjoke
info: Updated file: /home/qq/.cache/keybase/session.json

You need a passphrase to unlock the secret key for
user: "vecna (a Random GlobaLeks Developer) "
1024-bit DSA key, ID B842093DC6765430, created 2009-08-25

error: bad signature: Expected a signature on the payload message (error #1002)
$
```

Thanks!

Start by reproducing `keybase prove twitter sniffjoke` and inspect the reported error 1002, especially the `bad signature` message. Determine what information is available for diagnosing the failed Twitter proof and document a meaningful user-facing error or a clear way to find more details. No source file or test is identified in the issue.

Written by the indexing model from the issue text.