Unusable key

[Babkin, Alexander (GE Consumer Finance, consultant)]

I have imported public key and checked the finger print. The key import and fingerprint show no problems. 
Using edit-key I set the trust to u/u.
But when I try to encrypt file I get the following:

xtrace line 11: gpg --quiet --output /loyalty/GEMMA/out/test.csv.gpg --encrypt --recipient jlennan at gemmacom.com /loyalty/GEMMA/out/test.csv
gpg: WARNING: using insecure memory!
gpg: please see http://www.gnupg.org/faq.html for more information
gpg: jlennan at gemmacom.com: skipped: unusable public key
gpg: /loyalty/GEMMA/out/test.csv: encryption failed: unusable public key
xtrace line 11: exit

I would appreciate any help in solving this problem.

Regards,

Alexander Babkin
Sr. Consultant
Satyam, Shelton
' Work:    203-944-6171
* Mobile:  203-524-5025