error: Didn't find the key for 1 user-id(s) in the gpg database. This might mean it wasn't imported yet from the 'keys' directory.
The following user-id(s) could not be found in the gpg key database:
unkown@example.com (Key-file does not exist at 'keys/unkown@example.com')
All user-ids found in gpg database:
7435ACDC03D55429C41637C4DB9831D842C18D28 (user b <b@example.com>)