bower install failing for me

At the bower install step of the install, this is what I get.

	bower ECMDERR       Failed to execute "git ls-remote --tags --heads git@github.com:bbcrd/waveform-data.js.git", exit code of #128

	Additional error details:
	Permission denied (publickey).
	fatal: Could not read from remote repository.

	Please make sure you have the correct access rights
	and the repository exists.

Any ideas? I'm really excited to try this out, its exactly what I need for an idea I have.