No signature of method error after running flutter build appbundle - flutter

Question

I'm trying to build an app bundle for a flutter project, and ran "flutter build appbundle." However, I get the following error:
FAILURE: Build failed with an exception.
Where:
Build file '/Users/noah/Documents/wildtrack_app/android/app/build.gradle' line: 36
What went wrong:
A problem occurred evaluating project ':app'.
No signature of method: build_5nfu1zfyvrlq5vvix8fftxpa7.android() is applicable for argument types: (build_5nfu1zfyvrlq5vvix8fftxpa7$_run_closure2) values: [build_5nfu1zfyvrlq5vvix8fftxpa7$_run_closure2#59991e25]
This is the android block of the build.gradle file (line 36, where it says the error was):
android {
compileSdkVersion 33
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
sourceSets {
main.java.srcDirs += 'src/main/kotlin'
}
defaultConfig {
// TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
applicationId "com.wildtrack.WildTrackAI"
minSdkVersion 21
targetSdkVersion 31
versionCode 1
versionName 1
manifestPlaceholders = ['appAuthRedirectScheme': 'com.example.wildtrackapp']
}
signingConfigs {
release {
keyAlias keystoreProperties['keyAlias']
keyPassword keystoreProperties['keyPassword']
storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
storePassword keystoreProperties['storePassword']
}
}
buildTypes {
release {
signingConfig signingConfigs.release
}
}
}

Answer 1

Try running flutter clean && flutter pub get after making sure that you are in the project's root directory
If this doesn't work, make sure you've the following code before your android { } block
Example :
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))
}
android {
compileSdkVersion 33
...
}
And then run the flutter clean && flutter pub get again
If the issue still exists, check the path of the keystore.jks file