How to clone a BitBucket repository with Jenkins
For Jenkins 1.5 or greater( till 1.6)
The error you are getting because in the global configuration of Jenkins, the git path is not correct/or not inserted.
That's why Jenkins is unable to run the git command.
Please go to Manage Jenkins-> Configure System Settings
. Check for git section and add correct path.
Its already seems that you have removed the Git Clone from the URL provided by Bitbucket.
Update:
For Jenkins 2.0 or above
You can find this setting under Global tool configuration.