[Gambas-user] Uploading Package to Launchpad

[Christian e Ana Luiza Britto]

Hi,
I'm trying to upload a package, of my app created with Gambas, to
Launchpad and I'm receiving this error:

dput ppa:smcube/ppa smcube-zotero_0.0.9-0ubuntu1_amd64.changes
Checking signature on .changes
gpg: no valid OpenPGP data found.
gpg: the signature could not be verified.
Please remember that the signature file (.sig or .asc)
should be the first file given on the command line.
No signature on
/home/chriseana/Public/SmCube/Dev/smcube-zotero_0.0.9-0ubuntu1_amd64.changes.

Can someone help me handle that?
Thank you,
Christian