Good day,
I am new to Julia. I have installed Julia v0.50 and the latest version of Atom on a Windows 7 computer. The uber-juno package is installed as well. When I try to run Julia within Atom, I get the following error message:

and a pop-up window showing the following

When I try to run Pkg.add("Atom") in a terminal, I get the following error message:

Does anyone have an idea what I could do to solve this problem? Thanks a lot.
Regards, Joachim