go: go.mod file not found in current directory or any parent directory; see 'go help modules'

I just updated to the new version of Go - Go version 1.16.2 Linux/amd64 and am getting an error when I build a Hello, World! example:

go: go.mod file not found in current directory or any parent directory; see 'go help modules'

Even when I follow the fix from that post it isn't working. I set these variables and then build again:

GO111MODULE=on
GOPROXY=https://proxy.golang.org,direct

And the same problem unfortunately.

Change this:

go env -w GO111MODULE=auto

to this:

go env -w GO111MODULE=off

Yes, just follow the tutorial and for me that was doing go mod init test3 to create a module. No one else has been upgrading from the old version or everyone else just understood it properly I guess.

From your project directory, add this line of code in your Dockerfile file if you are building a Docker image:

RUN go mod init

Or this in your directory:

go mod init

First make sure that your GO111MODULE value is set to "auto". You can check it from:

go env

If it is not set to "auto", then run:

go env -w GO111MODULE=auto

Go to your work directory in terminal and run:

go mod init
go mod tidy

You are good to go!

This worked for me:

FROM golang:alpine

WORKDIR /go/src/app

ADD . .
RUN go mod init

RUN go build  -o /helloworld

EXPOSE 6111

CMD ["./helloworld"]