So, you are here with, “no buildable Go source files in the repo” error message.
Quick Solution :
# go get github.com/x/some-go-package/… ”
where “x/some-go-package” is for example, however pay attention to “…” part in above command. It will get you all packages and their dependencies under that path. Because the error is caused with the absense of “go” files in the provided ( root) path. In this example there is no ‘go’ files in ‘x/some-go-package’. If the issue is still not resolved please leave a comment.