command prompt fatal error

Same issue, ever find a solution?

It happens when you have a large file in your git repository. It's pretty well documented here:

https://confluence.atlassian.com/stashkb/git-push-fails-fatal-the-remote-end-hung-up-unexpectedly-282988530.html

This worked for me (setting it to 10MB) :
 

git config --global http.postBuffer 10485760

Just find the biggest file in your repository (e.g. using OminDiskSweeper or similar), add a bit extra (e.g. 1MB) and multiply its size in MB by 1048576.