isar사용 중 오류

Isar사용 중 아래와 같은 오류가 발생합니다. 어떻게 해결할 수 있을까요? 알려주시면 감사하겠습니다.

Launching lib\main.dart on sdk gphone64 x86 64 in debug mode...

Running Gradle task 'assembleDebug'...

FAILURE: Build failed with an exception.

* What went wrong:

A problem occurred configuring project ':isar_flutter_libs'.

> Could not create an instance of type com.android.build.api.variant.impl.LibraryVariantBuilderImpl.

> Namespace not specified. Specify a namespace in the module's build file. See https://d.android.com/r/tools/upgrade-assistant/set-namespace for information about setting the namespace.

If you've specified the package attribute in the source AndroidManifest.xml, you can use the AGP Upgrade Assistant to migrate to the namespace value in the build file. Refer to https://d.android.com/r/tools/upgrade-assistant/agp-upgrade-assistant for general information about using the AGP Upgrade Assistant.

* 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.

BUILD FAILED in 912ms

Error: Gradle task assembleDebug failed with exit code 1

allprojects {
    repositories {
        google()
        mavenCentral()
    }
}

rootProject.buildDir = "../build"
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}

subprojects {
    afterEvaluate { project ->
        if (project.hasProperty('android')) {
            project.android {
                if (namespace == null) {
                    namespace project.group
                }
            }
        }
    }
}

subprojects {
    project.evaluationDependsOn(":app")
}

tasks.register("clean", Delete) {
    delete rootProject.buildDir
}