Cannot parse result path string in android studio

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Java

Android

database

I am creating a room database for the first time. But I am facing a problem at build time. It gives me an error that

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:mergeDebugJavaResource'.
> A build operation failed.
      Cannot parse result path string:                     
   > Cannot parse result path string:                     

* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:mergeDebugJavaResource'.
	at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:38)
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:200)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:195)
.....................

Cannot parse result path string:
   at org.gradle.internal.operations.DefaultBuildOperationQueue.waitForCompletion(DefaultBuildOperationQueue.java:136)
   at org.gradle.internal.operations.DefaultBuildOperationExecutor.executeInParallel(DefaultBuildOperationExecutor.java:130)
   at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$runAll$4(DefaultBuildOperationExecutor.java:100)
   at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.runWithUnmanagedSupport(UnmanagedBuildOperationWrapper.java:45)
   at org.gradle.internal.operations.DefaultBuildOperationExecutor.runAll(DefaultBuildOperationExecutor.java:100)
   at org.gradle.api.internal.artifacts.ivyservice.resolveengine.artifact.ParallelResolveArtifactSet$VisitingSet.visit(ParallelResolveArtifactSet.java:65)
   at org.gradle.api.internal.artifacts.ivyservice.DefaultLenientConfiguration.visitArtifacts(DefaultLenientConfiguration.java:263)
   at org.gradle.api.internal.artifacts.ivyservice.DefaultLenientConfiguration.access$500(DefaultLenientConfiguration.java:72)
   at org.gradle.api.internal.artifacts.ivyservice.DefaultLenientConfiguration$2.run(DefaultLenientConfiguration.java:237)
   at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:29).............................................

gradle build files....

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:7.0.2"

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

plugins {
    id 'com.android.application'
}

android {
    compileSdk 31

    defaultConfig {
        applicationId "com.example.roomdetailsdatabase"
        minSdk 21
        targetSdk 31
        versionCode 1
        versionName "1.0"
        multiDexEnabled true

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    compileSdkVersion 31
    buildToolsVersion '31.0.0'
}

dependencies {

    implementation 'androidx.appcompat:appcompat:1.4.0'
    implementation 'com.google.android.material:material:1.4.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.2'
    annotationProcessor 'androidx.room:room-compiler:2.4.0-beta02'
    implementation 'androidx.room:room-runtime:2.4.0-beta02'

    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
    implementation 'com.android.support:multidex:2.0.1'
}

What I have tried:

I can not understand what is the problem and what to do. here Is my room database code.

@Entity
public class User {

    @PrimaryKey (autoGenerate = true)
    public int id;

    @ColumnInfo (name = "User Name")
    public String name;

    @ColumnInfo(name = "Age")
    public int age;

    public User(int id, String name, int age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

@Dao
public interface UserDao {

    @Query("SELECT * FROM user")
    List<User> getAll();
    @Insert
    void insertUser (User... users);
    @Delete
    void  deletation (User user);

}

@Database(entities = {User.class}, version = 1, exportSchema = false)
public abstract class AppDatabase extends RoomDatabase {

    public abstract UserDao userDao();
    public static AppDatabase INSTANCE;
    public static AppDatabase getDbInstance(Context context){
        if (INSTANCE == null){
            INSTANCE = Room.databaseBuilder(context.getApplicationContext(),AppDatabase.class, "MY_DB")
                    .allowMainThreadQueries().build();
        }
        return INSTANCE;
    }

}

from two edit text field I want store data in room database. here is the code.

public class MainActivity extends AppCompatActivity {
    EditText names,ages;
    Button btn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        names = findViewById(R.id.name);
        ages = findViewById(R.id.age);
        btn = findViewById(R.id.button);
        btn.setOnClickListener(view -> {
            newUser();

        });

    }

    private void newUser() {
        AppDatabase db = AppDatabase.getDbInstance(MainActivity.this);
        db.userDao().insertUser(new User(1, names.getText().toString(),Integer.parseInt(ages.getText().toString())));
        finish();
    }

}

Please help.