Repository does not exist. Create one using the instructions below.

Git Setup:

  Download and Install Git
  git config --global user.name ""
  git config --global user.email 

Permission Setup:

  Upload SSH Public Key
  Add yourself as a project developer: GEM Modellers Toolkit plugin Settings -> Members Tab -> New Member

Repository Setup:

  cd gem-mt
  git init
  git add .
  git commit -m 'Initializing GEM Modellers Toolkit plugin repository'
  git remote add origin gitosis@qgis.org:gem-mt.git
  git push origin master

Existing Git Repo?

  cd existing_git_repo
  git remote add origin gitosis@qgis.org:gem-mt.git
  git push origin master