When i run :- flutter build apk --release

Can anyone please help me out

SDK location not found. Define location with an ANDROID_SDK_ROOT environment variable or by setting the sdk.dir path in your project’s local properties file at ‘/home/prabhunath/snap/flutter/.pub-cache/hosted/pub.dartlang.org/adhara_socket_io-0.4.2+1/android/local.properties’