I don't use visual studio for golang so may be of limited use here if it is visual studio specific - but I've heard nothing but good things so its probably not...
I suspect the issue is that your GOPATH is set to
/Documents/go whereas you have placed your GOPATH in the Documents folder for your user. it should probably be something like
%My Documents%/go or the full path to that location e.g something like
Note: I have used nix style paths - as your output does, but when setting them via windows gui you should use windows conventions, e.g
To diagnose further I would first cut the ide out of the equation and jump to the command line.
go env to check your paths, look particularly at GOPATH which I suspect is your problem. If it is incorrect you should change it in environment variables (google change environment variables for you windows version) - as per note above follow the conventions of the other environment variables for setting the path (windows style specification,
go env doesn't work you have a bigger issue with your go install
If you are still having issues, please update your question, providing the output of
go env as well as an outline of how you installed go (Note: I think the MSI installer takes care of it all for you)
if go env looks fine to you, another debug step would be to attempt to install one of your tools manually from the command line and see what happens, e.g:
go get -u -v github.com/mdempsky/gocode
but if go env doesn't work that wont either and the issue is likely that your main go binary is not in you systems
PATH environment variable but it doesn't look like that