Not able to clone submodule along with tapku

[kumargagan4]

Gagan:curry IGT$ git submodule init
Submodule 'Vendor/curry' (git@github.com:devinross/curry.git) registered for path '../curry'
Gagan:curry IGT$ git submodule update
Cloning into 'Vendor/curry'...
Warning: Permanently added the RSA host key for IP address '192.30.252.121' 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.
Clone of 'git@github.com:devinross/curry.git' into submodule path 'Vendor/curry' failed