Help with try contribute to forge (My first time)

[SteveKunG]

This is my first time when I try contribute to forge. I follow this step : https://github.com/MinecraftForge/MinecraftForge/wiki/If-you-want-to-contribute-to-Forge

 

And I getting this error log.

 

 

F:\PortableGit\forge>gradlew setupForge

This set of MCP mappings was designed for MC 1.8.8. Use at your own peril.

 

FAILURE: Build failed with an exception.

 

* Where:

Build file 'F:\PortableGit\forge\build.gradle' line: 355

 

* What went wrong:

A problem occurred evaluating root project 'forge'.

> Cannot run program "git": CreateProcess error=2, The system cannot find the fi

le specified

 

* Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug

option to get more log output.

 

BUILD FAILED

 

Total time: 4.875 secs

 

F:\PortableGit\forge>

 

 

I don't know this is correct step? -.-