[Flutter] How to solve Flutter error: Could not find method versionName()

Actually I get a very strange error when I try to run a Flutter build for Android. First of all I want to show you the error. After that I show you the Flutter doctor result and specific code parts of my project.

Error after running android project with flutter run

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

Could not find method versionName() for arguments [1.0.0, null] on DefaultConfig_Decorated{name=main, dimension=null, minSdkVersion=DefaultApiVersion{mApiLevel=18, mCodename='null'}, targetSdkVersion=DefaultApiVersion{mApiLevel=28, mCodename='null'}, renderscriptTargetApi=null, renderscriptSupportModeEnabled=null, renderscriptSupportModeBlasEnabled=null, renderscriptNdkModeEnabled=null, versionCode=8, versionName=null, applicationId=de.danielederosa.virtualguestbook, testApplicationId=null, testInstrumentationRunner=null, testInstrumentationRunnerArguments={}, testHandleProfiling=null, testFunctionalTest=null, signingConfig=null, resConfig=null, mBuildConfigFields={}, mResValues={}, mProguardFiles=[], mConsumerProguardFiles=[], mManifestPlaceholders={}, mWearAppUnbundled=null} of type com.android.build.gradle.internal.dsl.DefaultConfig.
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BUILD FAILED in 6s Exception: Gradle task assembleDebug failed with exit code 1 Exited (sigterm)
​

build.gradle

buildscript {
ext.kotlin_version = '1.3.50'
repositories {
google()
jcenter()
}

dependencies {
classpath 'com.android.tools.build:gradle:3.6.2'
classpath 'com.google.gms:google-services:4.3.4'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}


gradle.wrapper.properties

distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-all.zip


pubspec.yaml

version: 1.0.0+8

It's interesting that it shows versionName=null, also if I overwrite the variable like this:

defaultConfig {
// TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
applicationId "de.danielederosa.virtualguestbook"
minSdkVersion 18
targetSdkVersion 28
versionCode flutterVersionCode.toInteger()
versionName '1.0.0',
multiDexEnabled true
}


Do you have any idea what could be the issue? Maybe some incompatibility with the gradle versions?

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