Windows: Only one usage of each socket address (protocol/network address/port) is normally permitted.

[jeremyjohn]

My go app is a http server with go routines.
When I run it the first time it's fine

watcher -c config -p 7777 -run /c/Projects/go/src/gitlab.com/jeremyjohn/http-project -watch gitlab.com/jeremyjohn/http-project

It starts two watcher-http-project process up and the main watch process.

But after changes to a .go file i get this error

2019/08/16 23:05:15 build started
Building C:/Projects/go/src/gitlab.com/jeremyjohn/http-project...
2019/08/16 23:05:16 build completed
Running C:/Projects/go/src/gitlab.com/jeremyjohn/http-project...
2019/08/16 23:05:16 listen tcp :7007: bind: Only one usage of each socket address (protocol/network address/port) is normally permitted.