Error while i open my android floating app player on some devices not all

Hello, i have an error that block my floating player to be played in some android devices not all, and when i check the error in android studio the error message lookalike:

 E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.BYTBFloatingta, PID: 8070
    android.app.RemoteServiceException: Bad notification for startForeground: java.lang.RuntimeException: invalid channel for service notification: Notification(channel=null pri=0 contentView=com.BYTBFloatingta/0x7f0b003e vibrate=null sound=null defaults=0x0 flags=0x40 color=0x00000000 vis=PUBLIC)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1737)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

and my code of handler.jave :

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

package android.os;

import android.annotation.NonNull;
import android.util.Printer;
import androidx.annotation.RecentlyNonNull;
import androidx.annotation.RecentlyNullable;

public class Handler {
    public Handler() {
        throw new RuntimeException("Stub!");
    }

    public Handler(@RecentlyNullable Handler.Callback callback) {
        throw new RuntimeException("Stub!");
    }

    public Handler(@RecentlyNonNull Looper looper) {
        throw new RuntimeException("Stub!");
    }

    public Handler(@RecentlyNonNull Looper looper, @RecentlyNullable Handler.Callback callback) {
        throw new RuntimeException("Stub!");
    }

    public void handleMessage(@RecentlyNonNull Message msg) {
        throw new RuntimeException("Stub!");
    }

    public void dispatchMessage(@RecentlyNonNull Message msg) {
        throw new RuntimeException("Stub!");
    }

    @NonNull
    public static Handler createAsync(@NonNull Looper looper) {
        throw new RuntimeException("Stub!");
    }

    @NonNull
    public static Handler createAsync(@NonNull Looper looper, @NonNull Handler.Callback callback) {
        throw new RuntimeException("Stub!");
    }

    @RecentlyNonNull
    public String getMessageName(@RecentlyNonNull Message message) {
        throw new RuntimeException("Stub!");
    }

    @RecentlyNonNull
    public final Message obtainMessage() {
        throw new RuntimeException("Stub!");
    }

    @RecentlyNonNull
    public final Message obtainMessage(int what) {
        throw new RuntimeException("Stub!");
    }

    @RecentlyNonNull
    public final Message obtainMessage(int what, @RecentlyNullable Object obj) {
        throw new RuntimeException("Stub!");
    }

    @RecentlyNonNull
    public final Message obtainMessage(int what, int arg1, int arg2) {
        throw new RuntimeException("Stub!");
    }

    @RecentlyNonNull
    public final Message obtainMessage(int what, int arg1, int arg2, @RecentlyNullable Object obj) {
        throw new RuntimeException("Stub!");
    }

    public final boolean post(@RecentlyNonNull Runnable r) {
        throw new RuntimeException("Stub!");
    }

    public final boolean postAtTime(@RecentlyNonNull Runnable r, long uptimeMillis) {
        throw new RuntimeException("Stub!");
    }

    public final boolean postAtTime(@RecentlyNonNull Runnable r, @RecentlyNullable Object token, long uptimeMillis) {
        throw new RuntimeException("Stub!");
    }

    public final boolean postDelayed(@RecentlyNonNull Runnable r, long delayMillis) {
        throw new RuntimeException("Stub!");
    }

    public final boolean postDelayed(@RecentlyNonNull Runnable r, @RecentlyNullable Object token, long delayMillis) {
        throw new RuntimeException("Stub!");
    }

    public final boolean postAtFrontOfQueue(@RecentlyNonNull Runnable r) {
        throw new RuntimeException("Stub!");
    }

    public final void removeCallbacks(@RecentlyNonNull Runnable r) {
        throw new RuntimeException("Stub!");
    }

    public final void removeCallbacks(@RecentlyNonNull Runnable r, @RecentlyNullable Object token) {
        throw new RuntimeException("Stub!");
    }

    public final boolean sendMessage(@RecentlyNonNull Message msg) {
        throw new RuntimeException("Stub!");
    }

    public final boolean sendEmptyMessage(int what) {
        throw new RuntimeException("Stub!");
    }

    public final boolean sendEmptyMessageDelayed(int what, long delayMillis) {
        throw new RuntimeException("Stub!");
    }

    public final boolean sendEmptyMessageAtTime(int what, long uptimeMillis) {
        throw new RuntimeException("Stub!");
    }

    public final boolean sendMessageDelayed(@RecentlyNonNull Message msg, long delayMillis) {
        throw new RuntimeException("Stub!");
    }

    public boolean sendMessageAtTime(@RecentlyNonNull Message msg, long uptimeMillis) {
        throw new RuntimeException("Stub!");
    }

    public final boolean sendMessageAtFrontOfQueue(@RecentlyNonNull Message msg) {
        throw new RuntimeException("Stub!");
    }

    public final void removeMessages(int what) {
        throw new RuntimeException("Stub!");
    }

    public final void removeMessages(int what, @RecentlyNullable Object object) {
        throw new RuntimeException("Stub!");
    }

    public final void removeCallbacksAndMessages(@RecentlyNullable Object token) {
        throw new RuntimeException("Stub!");
    }

    public final boolean hasMessages(int what) {
        throw new RuntimeException("Stub!");
    }

    public final boolean hasMessages(int what, @RecentlyNullable Object object) {
        throw new RuntimeException("Stub!");
    }

    public final boolean hasCallbacks(@NonNull Runnable r) {
        throw new RuntimeException("Stub!");
    }

    @RecentlyNonNull
    public final Looper getLooper() {
        throw new RuntimeException("Stub!");
    }

    public final void dump(@RecentlyNonNull Printer pw, @RecentlyNonNull String prefix) {
        throw new RuntimeException("Stub!");
    }

    public String toString() {
        throw new RuntimeException("Stub!");
    }

    public interface Callback {
        boolean handleMessage(@RecentlyNonNull Message var1);
    }
}

my code of looper.jave :

    //
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

package android.os;

import android.annotation.NonNull;
import android.annotation.Nullable;
import android.util.Printer;

public final class Looper {
    Looper(boolean quitAllowed) {
        throw new RuntimeException("Stub!");
    }

    public static void prepare() {
        throw new RuntimeException("Stub!");
    }

    public static void prepareMainLooper() {
        throw new RuntimeException("Stub!");
    }

    public static Looper getMainLooper() {
        throw new RuntimeException("Stub!");
    }

    public static void loop() {
        throw new RuntimeException("Stub!");
    }

    @Nullable
    public static Looper myLooper() {
        throw new RuntimeException("Stub!");
    }

    @NonNull
    public static MessageQueue myQueue() {
        throw new RuntimeException("Stub!");
    }

    public boolean isCurrentThread() {
        throw new RuntimeException("Stub!");
    }

    public void setMessageLogging(@Nullable Printer printer) {
        throw new RuntimeException("Stub!");
    }

    public void quit() {
        throw new RuntimeException("Stub!");
    }

    public void quitSafely() {
        throw new RuntimeException("Stub!");
    }

    @NonNull
    public Thread getThread() {
        throw new RuntimeException("Stub!");
    }

    @NonNull
    public MessageQueue getQueue() {
        throw new RuntimeException("Stub!");
    }

    public void dump(@NonNull Printer pw, @NonNull String prefix) {
        throw new RuntimeException("Stub!");
    }

    public String toString() {
        throw new RuntimeException("Stub!");
    }
}

to test my app : click here to open un playsore

you can run the app and define the error, the application work on some devices and some other don't work

Thank you in advance.