Git clone error

[root@aspire038 git-1.5.6]# git clone git@github.com:/ayyanar/adva_cms.git
Initialize adva_cms/.git
Initialized empty Git repository in /root/Desktop/git-1.5.6/adva_cms/.git/
The authenticity of host 'github.com (65.74.177.129)' can't be established.
RSA key fingerprint is 16:27:ac:a5:76:28:2d:36:63:1b:56:4d:eb:df:a6:48.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'github.com,65.74.177.129' (RSA) to the list of
known hosts.
Permission denied (publickey).
fatal: The remote end hung up unexpectedly
[root@aspire038 git-1.5.6]# git clone
git@github.com:/karthikeyan7585/adva_cms.git
Initialize adva_cms/.git
Initialized empty Git repository in /root/Desktop/git-1.5.6/adva_cms/.git/
Permission denied (publickey).
fatal: The remote end hung up unexpectedly
[root@aspire038 git-1.5.6]# 



The permission denied error is comming . Please help me.
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