go build: no Go files in /msfs2020-go-master

Im trying to rebuild a golang github repository to apply some minor changes.

The go application Im trying to modify is the following https://github.com/lian/msfs2020-go
Please use the provided github link to inspect the file tree.

I used the master branch and extracted it to /user/Documents/msfs2020-go-master

If I call go build from /user/Documents/msfs2020-go-master the output equals: no Go files in /user/Documents/msfs2020-go-master

I tried deleting the go.mod and recreating it with go mod init github.com/lian/msfs2020-go followed with a go mod tidy
but still no Go files in /user/Documents/msfs2020-go-master

Here the current go.mod

module github.com/lian/msfs2020-go

go 1.16

require github.com/gorilla/websocket v1.4.2

And here the go.sum

github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0Ufc=
github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=

The master was build with 1.14 and Im using 1.16 golang.
All my test go applications/modules run/build/install fine at a "Hello World" developing level.

What did I do wrong? I gladly accept any input and will provide additional information's if requested.

The command go build builds the package in the current working directory. The command reports an error because there is not a package at the root of the repository.

Fix by building the package containing the command. Any of the following will work from the root of the repository:

go build ./vfrmap

or

cd vrfrmap
go build

or

go build github.com/lian/msfs2020-go/vfrmap

See also the file build-vfrmap.sh.