[Flow] TYPO3.Surf with Bitbucket

[Mario]

Hey, I am not sure if this is the right forum for my question but as I am trying to deploy my TYPO3 Flow application I try this here. My git repository is hosted at bitbucket and so I try to define this inside my Build/Surf/TestDeployment.php like this

..
$application = new \TYPO3\Surf\Application\TYPO3\Flow();
$application->setDeploymentPath('/var/www/myApplication');
$application->setOption('repositoryUrl', 'git (at) bitbucket.org:xxx/myApplication.git');
$application->setOption('username', 'myName');
$application->setOption('password', '123456789');
$application->setOption('branch', 'develop');
$application->addNode($node);
..

When running 

/flow surf:simulate TestDeployment 

I always got the error message:
"Got exception "Could not retrieve sha1 of git branch "develop"" rolling back."

Did I do something wrong defining the application?