This error I got when taking app bundle build

I added signingConfigs in app level build gradle

here is the one I got error while using

when using this am getting the error

    signingConfigs {
        create("release") {
            keyAlias = keystoreProperties["keyAlias"] as String
            keyPassword = keystoreProperties["keyPassword"] as String
            storeFile = keystoreProperties["storeFile"]?.let { file(it) }
            storePassword = keystoreProperties["storePassword"] as String
        }
    }

and this code am changed

    signingConfigs {
        create("release") {
            keyAlias keystoreProperties["keyAlias"]
            keyPassword keystoreProperties["keyPassword"] 
            storeFile keystoreProperties["storeFile"] ? file(keystoreProperties['storeFile']):null
            storePassword keystoreProperties["storePassword"]
        }
    }