It seams you never got the source completely
(git clone is error prone

)
fatal index-pack failed
the remote end hung unexpectedly
btw
You should attach the log instead of a screenshot
There are 2 options
1) delete the ufoai source and retry (but pray before)
2) run ?:\UFOAIwin32BUILDenv\MinGW\msys.bat and (careful *inux shell)
cmd /c "start %WD%bash --login -i"
git wont return all output into a minitty console, its better to use sh instead
cd /ufoai
git fsck
and google for this error to fix it