keybase prove fails with error 1002

Just installed keybase and pushed my PGP key (https://keybase.io/kravietz). Now, command:

```
keybase -d prove twitter kravietz2
```

fails with the following error:

```
error: bad signature: We don't have a key for the requested PGP ops (error #1002)
```

Here are my keys:

```
$ gpg -K --with-fingerprint --with-colons 07E16AEB648F17ED
sec::1024:1:88CED450C4DD9DCA:1144873541::::::escaESCA::::
fpr:::::::::462E1F1AEF9FBEBCCF62602188CED450C4DD9DCA:
uid:::::1144873542::BF23CA8FD18C55D5E8B3790D599114880DA7AD15::"pawel.krawczyk@hush.com" :
uid:::::1144873541::C6D833D262962A320B779965F7A0773EBE684C7A::keybase.io/kravietz :
ssb::2048:1:07E16AEB648F17ED:1144873542::::::esca::::
```

Reproduce the failure with `keybase -d prove twitter kravietz2` and compare it with the supplied error #1002 and GPG key details. Trace the PGP handling used by the prove command, then verify that the same Twitter proof succeeds with the listed key.

Written by the indexing model from the issue text.