Hi @saqibalikhan.pkgupr9, welcome to Thunkable! 
This is just a warning. It will be required to publish an update for your app, but first, our engineers will need to update the Android version.
We have flagged it to our engineering team and will provide an update as soon as possible.
Be sure to check out How to ask Great Questions v2.0, the Community Guidelines, and our Getting Started Guide to make the best of your Thunkable Community experience!