关于elasticsearch测试工具rally启动失败

启动esrally命令后，报如下错误，请大家帮忙看一哈
Writing additional logs to /home/es/.rally/benchmarks/races/2016-09-08-14-31-30/local/logs/rally_out.log

Unknown option: -C
usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--html-path]
           [-p|--paginate|--no-pager] [--no-replace-objects]
           [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE]
           [--help] COMMAND [ARGS]

ERROR: Cannot race

Reason: This race ended early with a fatal crash. For details please see the logs.

Please check the log file [/home/es/.rally/benchmarks/races/2016-09-08-14-31-30/local/logs/rally_out.log] for further details first.

If you need further help, please check Rally's docs at https://esrally.readthedocs.io or ask a question in the forum at https://discuss.elastic.co/c/rally.

If you think this is a bug, please file a report at https://github.com/elastic/rally/issues and include the log file for this race (/home/es/.rally/benchmarks/races/2016-09-08-14-31-30/local/logs/rally_out.log).