Sourcetree unable to clone from BitBucket

[Shobha Nagaraja]

When I clone a BitBucket repo using the SSH method in source tree, I get the following error 

Error: error: cannot spawn C:/Windows/System32/OpenSSH/ssh.exe: No such file or directory
fatal: unable to fork.

Additionally, I see this error message as well,

This is not a valid source path/URL. When clicked, the Details button reveals the above error as cannot find ssh.exe. But I do have this on my computer.