Bad notification for startForeground: invalid channel for service notification

[brarcher]

The following was reported by a user:

user_action: ui error
request: App crash, UI failure
content_language: en
service: none
package: protect.videoeditor
version: 0.8
os: Linux Android P - 27
time: 2018-05-19 05:15

exceptions:

android.app.RemoteServiceException: Bad notification for startForeground: java.lang.RuntimeException: invalid channel for service notification: Notification(channel=null pri=0 contentView=null vibrate=null sound=null defaults=0x0 flags=0x42 color=0x00000000 vis=PRIVATE)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1724)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6649)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:826)

The issue is that in Android 8.1 a notification channel is required, and failing to create one is a RemoteServiceException.