Hello:

I have seen similar problem to mine, however, those solutions are not working. 

I did the following : 

git remote add origin https://github.com/ManufADE/rpio4.gitgit push -u origin master

On a repository which had already been set up. I get: 

remote: Repository not found.
fatal: repository ‘https://github.com/ManufADE/rpio4.git/’ not found

Now, https://github.com/ManufADE/rpio4 exists! And I copied the above git commands directly from GitHub’s.  page (as is recomended) . 

Does anyone have a solution or some suggested steps for debug.