React / CS Code editor: Compiled successfully! .. and not working

Hello Community,
I am working on the Jamming project as part of React II chapter. Visual code editor worked just fine 'till step 34. Now I got this:
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Compiled successfully! …yet I can’t see anything on my screen on local host 3000.
Before coming here went to stack overflow where there is a ticket raised but not resolved. Github the same.
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