human
Solve the following python programming problem given the following code:
def mount_or_unmount(args, mount = True) : 
    cluster = common.ecluster_config (args.econfig).load_cluster (args.cluster) 
    inventory_path = os.path.join (cluster.repository.storage_path, 'ansible-inventory.{}'.format (args.cluster)) 
    if mount : 
        playbook_file = 'mount.yml' 
else : 
        playbook_file = 'unmount.yml' 
playbook_path = os.path.join (common.ANSIBLE_BASE, 'roles', 'lustre_client', 'tasks', playbook_file) 
    def get_lustre_vars(args, cluster_config) : 
        return { 
            'lustre_fs_spec' : _get_fs_spec (args.stack_name, cluster_config ['cloud']), 
} 
common.run_ansible_pb (inventory_path, playbook_path, args, mount) 

    
    

    Fix the buggy line: common.run_ansible_pb (inventory_path, playbook_path, args, mount)
assistant
#Here is Python code to fix the buggy line: common.

common.run_ansible_pb (inventory_path, playbook_path, args, def get_lustre_vars()