window7 software cmder error

```
λ git cz
C:\Users\KevinSu\AppData\Roaming\npm\node_modules\commitizen\dist\cli\strategies\git-cz.js:87
throw new Error('No files added to staging! Did you forget to run git add?');
^

Error: No files added to staging! Did you forget to run git add?
at C:\Users\KevinSu\AppData\Roaming\npm\node_modules\commitizen\dist\cli\strategies\git-cz.js:87:13
at C:\Users\KevinSu\AppData\Roaming\npm\node_modules\commitizen\dist\commitizen\staging.js:25:5
at ChildProcess.exithandler (child_process.js:195:7)
at emitTwo (events.js:106:13)
at ChildProcess.emit (events.js:191:7)
at maybeClose (internal/child_process.js:886:16)
at Socket. (internal/child_process.js:342:11)
at emitOne (events.js:96:13)
at Socket.emit (events.js:188:7)
at Pipe._handle.close [as _onclose] (net.js:497:12)
```

cmd module is OK