Can't use private key to login into server

[ksham]

I can log into my server using putty, however I cannot login using SecureCRT.

I exported the key using "Putty Key Generator" -> Conversions -> "Export Open SSH Key"

My servers /var/log/auth.log shows this when I try to login:

Jul 3 16:59:38 servername sshd[24327]: error: bad sig size 32 32
Jul 3 16:59:38 servername sshd[24327]: fatal: mm_answer_sign: key_sign failed


Any insight would be great!