This system force required to: You have to must have GO111MODULE environment variable that activates go mod module.
Therefore, it set into.
$ export GO111MODULE=on
or use direnv.
$ brew install direnv
$ go get -u github.com:eiicon-company/go-core
$ go get -u github.com:eiicon-company/go-core/v1
$ go get -u github.com:eiicon-company/go-core@rom5kdxv4kfq0uhfq1hfq4
Make sure what tasks are existing.
$ make help
Update Golang dependencies. This command would be help you when something went wrong happended.
$ make gomodule