@Sanjay_Khatiwada you didn’t give a space between command
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Ok I will try again in later or tomorrow
hi i did it successfully i am using another device i.e win10 and it creates AAB file. while what I did at that time was using a win7 device. thank you all for the help.
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i have done lets try in playstore 
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thank you simpledimple i have done and waiting or playstore review .
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Refer This
Hey, can you make a video on youtube showing how to make it from scratch? api 29 to 30 steps to do and what to do from required applications like pyton
and whatever is necessary. Please
help
welcome to the Community
The Video for Short Method (easy is Given)
Please refer
I want to tell you that I succeeded in doing the long method but I signed the app using jarsigner. Thank you so much 
I want to add a useful information that you can use the same bundle tool which generated aab file to convert aab to apk to ensure that you built the aab correctly.
just write:
java -jar bundletool-all-1.8.0.jar build-apks --bundle=“test.aab” --output=“test.apks” --mode=“universal”
Then extract test.apks, you will find universal.apk which is your app APK
I mastered building aab and apk manually 
Thanks for great tutorial
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If google play accepted your aab then these errors are not related to the app itself but you have to give google play some information as the app is not a COVID-19 contact tracing.
You can easily write:
jarsigner -keystore android.keystore (*.aab) (alias)
very easy
Basically play store want to know if your app Covid 19 tracking or not
You’re welcome 
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Yes i am also facing same issue
It’s resolved when i closed previous command prompt and open the command prompt as Administrator.
He is talking about GIT Command prompt