Buildfailed : Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0

I'm using react-native and even I'm able to run my app in my simulator succesfully. But when i build the app I'm getting this error.

Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.Use '--warning-mode all' to show the individual deprecation warnings.See https://docs.gradle.org/6.0.1/userguide/command_line_interface.html#sec:command_line_warnings

I even installed jetifier. But nothing worked fine..

for both ./gradlew bundleRelease and ./gradlew assembleRelease I'm getting the Error.But for ./gradlew assembleRelease -x bundleReleaseJsAndAssets I'm not getting erro BUT that apk is not working in a physical device. It simply crashes.