Can't work on MSYS2

[alienzj]

Hi !
I have git clone your yaggo project to my msys2 home directory.
I have installed all the tools that needed by the yaggo,sush as make , ruby, gcc.
But when i do : yaggo parser.yaggo,then it tell me:

 D:/msys64/home/lovel/bin/yaggo:102:in `fork': fork() function is unimplemented on this machine  (NotImplementedError)
        from D:/msys64/home/lovel/bin/yaggo:102:in `block in main'
        from D:/msys64/home/lovel/bin/yaggo:101:in `each'
        from D:/msys64/home/lovel/bin/yaggo:101:in `main'
        from D:/msys64/home/lovel/bin/yaggo:6:in `<main>'``

Can you help me? Thanks very much!