Cannot read property 'getManifests' of undefined when working with sharepoint framework

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I follow all the steps given in https://docs.microsoft.com/en-us/sharepoint/dev/spfx/web-parts/get-started/build-a-hello-world-web-p..., still i get error saying manifest.js file not found in temp folder and Uncaught TypeError: Cannot read property 'getManifests' of undefined. please find the attached image.
I am new to sharepoint framework. Please guide me to resolve the issue as soon as possible.

  

I dont find manifest file in temp folder.If i remove the reference in workbench.html, first two issue will resolve. Still i have another two issue remaining uncaught type error getmanifests is undefinedErr.png

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