Project venenux/simplegastos was moved to another location.
The project is now located under codeigniterpower / simplegastos.
To update the remote url in your local repository run (for ssh):
git remote set-url origin g...@gitlab.com:codeigniterpower/simplegastos.git
or for http(s):
git remote set-url origin https://gitlab.com/codeigniterpower/simplegastos.git