Recently, i upgraded the dependencies of my Flutter project and migrated project to Material Design 3. Everything went well util i tried to release a new version. Some dependencies require Gradle 7+, so i just upgraded Gradle version, but this caused the following error:

Ambiguous method overloading for method
com.android.build.gradle.internal.dsl.ProdctFlavor$AgpDecorated_Decorated#signingConfig.
Cannot resolve which method to invoke for [null] due to overlapping prototypes between

previous build.gradle

buildTypes {
	release {
		signingConfig signingConfigs.release
	}
}
  
flavorDimensions "deploy"

productFlavors {
	github {
            dimension "deploy"
            signingConfig signingConfigs.release
    }
	fdroid {
		dimension "deploy"
		signingConfig null
	}

}

There's no double that some changes happened in Gradle 7 and signingConfig null is not supported anymore. Since signingConfig can't be null, we can set it to an empty instance.

build.gradle

buildTypes {
	release {
		signingConfig signingConfigs.release
	}
	debug {
	}
}

flavorDimensions "deploy"

productFlavors {
	github {
		dimension "deploy"
		signingConfig signingConfigs.release
	}
	fdroid {
		dimension "deploy"
		signingConfig signingConfigs.debug
	}
}

We added a debug object into buildTypes paramters and replaced signingConfig null with signingConfig signingConfigs.debug. This change allow project to build the apk without sign and without erros.