部署到Heroku时无法推送一些参考错误

Question

我有一个希望部署到Heroku的Go App

每当我在Go App上运行git push heroku master时，都会收到以下错误消息：

remote:  !!    
remote: -----> New Go Version, clearing old cache
remote: -----> Installing go1.12.17
remote: -----> Fetching go1.12.17.linux-amd64.tar.gz... done
remote: -----> Determining packages to install
remote:  !     Push rejected, failed to compile Go app.
remote:
remote:  !     Push failed
remote: Verifying deploy...
remote:
remote: !       Push rejected to appname.
remote:
To https://git.heroku.com/appname.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/appname.git'

我似乎找不到可能出问题的地方。但是我的main.go文件在这样的子包中

src
  launcher
     main.go

现在在main.go里面

package main   //<-The main package is indicated here

func main(){

}

heroku是否可能因为子包中的内容而没有看到我的main.go文件？