Error finding current repository: could not determine repository path from module data, package data, or by initializing a module: go

Symptom:

When we run kubebuilder init,  we get below error
$kubebuilder init --domain my.domain
2019/05/29 16:23:45 error finding current repository: could not determine repository path from module data, package data, or by initializing a module: go: cannot determine module path for source directory /home/henryxie/go/kubebuilder-src/my.domain/ (outside GOPATH, no import comments)

Solution:

It is due to go mod init is not working properly.
To fix it
run go mod init  <directory>    ie   go mod init myfirstcontroller
then kubebuilder init --domain my.domain