Problem build android

When i run ionic cordova build android i have this problem

Android Studio project detected
ANDROID_HOME=C:\platform_tools
JAVA_HOME=C:\Program Files\Java\jdk1.8.0_231
studio
Subproject Path: CordovaLib
Subproject Path: app

FAILURE: Build failed with an exception.

  • Where:
    Script ‘C:\Users\Youssef\Desktop\test\App\platforms\android\CordovaLib\cordova.gradle’ line: 68

  • What went wrong:
    A problem occurred evaluating project ‘:CordovaLib’.

No installed build tools found. Install the Android build tools version 19.1.0 or higher.

  • Try:
    Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

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

BUILD FAILED in 2s
cmd: Command failed with exit code 1 Error output:
FAILURE: Build failed with an exception.

  • Where:
    Script ‘C:\Users\Youssef\Desktop\test\App\platforms\android\CordovaLib\cordova.gradle’ line: 68

  • What went wrong:
    A problem occurred evaluating project ‘:CordovaLib’.

No installed build tools found. Install the Android build tools version 19.1.0 or higher.

  • Try:
    Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

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

BUILD FAILED in 2s
[ERROR] An error occurred while running subprocess cordova.

    cordova.cmd build android exited with exit code 1.

    Re-running this command with the --verbose flag may provide more information.

ionic info

Ionic:

   Ionic CLI                     : 5.4.5 (C:\Users\Youssef\AppData\Roaming\npm\node_modules\ionic)
   Ionic Framework               : @ionic/angular 4.11.3
   @angular-devkit/build-angular : 0.801.3
   @angular-devkit/schematics    : 8.1.3
   @angular/cli                  : 8.1.3
   @ionic/angular-toolkit        : 2.0.0

Cordova:

   Cordova CLI       : 9.0.0 (cordova-lib@9.0.1)
   Cordova Platforms : android 7.1.0
   Cordova Plugins   : cordova-plugin-ionic-keyboard 2.2.0, cordova-plugin-ionic-webview 4.1.3, (and 4 other plugins)

Utility:

   cordova-res : 0.8.1
   native-run  : 0.2.9

System:

   NodeJS : v12.13.0 (C:\Program Files\nodejs\node.exe)
   npm    : 6.12.1
   OS     : Windows 10

And when I installed apk in my phone it was white screen
please help me