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build.gradle

Which part is unclear?
The error says you have a problem on line 54.
That line is
> ```minSdkVersion localProperties.getProperty('flutter.minSdkVersion').toInteger()```
And the error says you are invoking `toInteger()` on `null`.

So you miss to have `flutter.minSdkVersion` set in your `local.properties` file in your root project.