When running "flutter build appbundle" on my vs code terminal appear error.

FAILURE: Build failed with an exception.

  • Where: Build file 'C:\MyApps\FLUTTER\Game\game\android\app\build.gradle' line: 31

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

Malformed \uxxxx encoding.

  • 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

              def localProperties = new Properties()
          def localPropertiesFile = rootProject.file('local.properties')
          if (localPropertiesFile.exists()) {
              localPropertiesFile.withReader('UTF-8') { reader ->
                  localProperties.load(reader)
              }
          }
    
          def flutterRoot = localProperties.getProperty('flutter.sdk')
          if (flutterRoot == null) {
              throw new GradleException("Flutter SDK not found. Define 
       location with flutter.sdk in the local.properties file.")
          }
    
          def flutterVersionCode = 
      localProperties.getProperty('flutter.versionCode')
          if (flutterVersionCode == null) {
              flutterVersionCode = '1'
          }
    
          def flutterVersionName = 
      localProperties.getProperty('flutter.versionName')
          if (flutterVersionName == null) {
              flutterVersionName = '1.0'
          }
    
          apply plugin: 'com.android.application'
          apply plugin: 'kotlin-android'
          apply from: 
      "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
    
          def keystoreProperties = new Properties()
          def keystorePropertiesFile = rootProject.file('key.properties')
          if (keystorePropertiesFile.exists()) {
              keystoreProperties.load(new 
      FileInputStream(keystorePropertiesFile))    //line 31
          }
    
          android {
              compileSdkVersion 30
    
              sourceSets {
                  main.java.srcDirs += 'src/main/kotlin'
              }
    
              lintOptions {
                  disable 'InvalidPackage'
              }
    
              defaultConfig {
                  // TODO: Specify your own unique Application ID 
    

    (https://developer.android.com/studio/build/application-id.html). applicationId "com.example.game" minSdkVersion 16 targetSdkVersion 30 versionCode flutterVersionCode.toInteger() versionName flutterVersionName }

              signingConfigs {
              release {
                  keyAlias keystoreProperties['keyAlias']
                  keyPassword keystoreProperties['keyPassword']
                  storeFile keystoreProperties['storeFile'] ? 
    

    file(keystoreProperties['storeFile']) : null storePassword keystoreProperties['storePassword'] } } buildTypes { release { signingConfig signingConfigs.release } }

          }
    
          flutter {
              source '../..'
          }
    
          dependencies {
              implementation "org.jetbrains.kotlin:kotlin-stdlib- 
     jdk7:$kotlin_version"
          }