node.js - Cannot get node hello world app to deploy on GCloud -

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i cannot life of me the hello world app google provides work. following tutorial here: https://cloud.google.com/nodejs/getting-started/hello-world

i have followed steps , hello world code runs on local machine. however, when try run gcloud preview app deploy app.yaml --promote following output: 

you deploy following modules:  - empirical-lens-111022/default (from [c:\users\zakpt\downloads\nodejs-getting-started-1-hello-world\nodejs-getting-started-1-hello-world\app.yaml])  deployed url: [https://empirical-lens-111022.appspot.com]  want continue (y/n)?  y  beginning deployment... verifying managed vms enabled , ready.  provisioning remote build service. copying certificates secure access. may prompted create ssh keypair. error: (gcloud.preview.app.deploy) couldn't connect docker daemon.

i have no idea do, since docker isn't mentioned @ in tutorial, , googling has shown solutions osx. on windows 10


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