Package authentication error

[RoverSM]

Hi all,
I have setup a debian repository on one of my servers.
i have signed one package using the dpkg-sig command. The client machine
is able to fetch the servers address without any error on running the apt-get update command.
I have also exported the gpg key and it shows under the apt-key list command.
But when i try to install a package that i have signed the following error
is shown. It is an urgent project requirement , so any help would be appreciated.


WARNING: The following packages cannot be authenticated!
Install these packages without verification [y/N]?

[raja.genupula]

yeah they are third-party software . say yes if you're sure with what software you're installing . other wise say no .

[RoverSM]

hi Raja,
I have already signed the packge on my server but still this error comes up, that is my question.