modman clone fails

[pquerner]

modman clone https://github.com/techdivision/TechDivision_MagentoUnitTesting.git
Cloning into 'TechDivision_MagentoUnitTesting'...
remote: Counting objects: 6545, done.
remote: Total 6545 (delta 0), reused 0 (delta 0), pack-reused 6545
Receiving objects: 100% (6545/6545), 45.94 MiB | 10.13 MiB/s, done.
Resolving deltas: 100% (3071/3071), done.
Checking connectivity... done.
Submodule 'doc' (git@github.com:techdivision/TechDivision_MagentoUnitTesting.wiki.git) registered for path 'doc'
Cloning into 'doc'...
Warning: Permanently added the RSA host key for IP address '192.30.253.112' to the list of known hosts.
Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
fatal: clone of 'git@github.com:techdivision/TechDivision_MagentoUnitTesting.wiki.git' into submodule path 'doc' failed
ERROR: trying to clone new module 'TechDivision_MagentoUnitTesting', operation cancelled.