title: Your app is not on your GOPATH - deploying to app Engine go1.12
body: <p>i have an problem with appengine and go112. </p>
  
  <p>i can´t deploy without an error to the cloud:</p>
  
  <pre><code>2019/09/04 14:36:10 Copying /workspace/_gopath/src/mysql to /tmp/staging/srv/gopath/src/mysql
  2019/09/04 14:36:10 Your app is not on your GOPATH, this build may fail.
  2019/09/04 14:36:10 Building from Go source in /tmp/staging/srv, with main package at ./...
  2019/09/04 14:36:10 Building /tmp/staging/srv, saving to /tmp/staging/usr/local/bin/start
  2019/09/04 14:36:11 Wrote build output to /builder/outputs/output
  2019/09/04 14:36:11 Failed to build app: Your app is not on your GOPATH, please move it there and try again.
  building app with command '[go build -o /tmp/staging/usr/local/bin/start ./...]', env '[PATH=/go/bin:/usr/local/go/bin:/builder/google-cloud-sdk/bin/:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin HOSTNAME=89fd1b631b04 HOME=/builder/home BUILDER_OUTPUT=/builder/outputs DEBIAN_FRONTEND=noninteractive GOROOT=/usr/local/go/ GOPATH=/go GOPATH=/tmp/staging/srv/gopath]': err=exit status 1, out=go build: cannot use -o with multiple packages.
  PS C:\gopath\projects\gp-sql&gt;
  </code></pre>
  
  <p>My project is under the gopath and i tried serveral modifications of it.</p>
  
  <p><img src="https://i.imgur.com/zDV9s6m.png" alt="image"></p>
  
  <p>output of "go env"</p>
  
  <pre><code>set GOPATH=C:\gopath
  set GOROOT=C:\golang
  </code></pre>
  
  <p>Anybody an idea what i´m missing?</p>