Problem to run the application showing some error message in Flutter

Question

PS D:\Development\ULTIMAT POS\App POS Backup\UltimatePOS_Flutter_1.7.1\pos> flutter run Launching lib\main.dart on M2102J20SG in debug mode...

FAILURE: Build failed with an exception.

• Where: Build file 'D:\Development\ULTIMAT POS\App POS Backup\UltimatePOS_Flutter_1.7.1\pos\android\app\build.gradle' line: 50

• What went wrong: A problem occurred evaluating project ':app'.

Could not get unknown property 'minSdkVersion20' for extension 'flutter' of type FlutterExtension.

• Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

BUILD FAILED in 3s Running Gradle task 'assembleDebug'... 4.6s Exception: Gradle task assembleDebug failed with exit code 1

Answer 1

Go to your App level build.gradle file in android folder and then change

minSdkVersion 20

to

minSdkVersion flutter.minSdkVersion

Hope it will solve your error

Answer 2

try change minSdkVersion20 -> minSdkVersion 21 (add space before version)