creat project 出错

按照wiki 的步骤操作，结果在create project 的时候报告下面的错误，有人知道是什么原因吗？


[INFO-Build] 0.2.26
[INFO-Build] Execute aos new C:\Users\Angus\AliOS-Things-project\myProject at e:\work-an\AliOS-Things-master
[INFO-Build] [AliOS-Things] Create new program "C:\Users\Angus\AliOS-Things-project\myProject" (git)
[ERROR-Build] [AliOS-Things] ERROR: Could not detect one of the command-line tools.
[AliOS-Things] ERROR: You could retry the last command with "-v" flag for verbose output