java.lang.IllegalArgumentException: Unknown operation string: android:system_alert_window

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java.lang.IllegalArgumentException: Unknown operation string: android:system_alert_window
at android.app.AppOpsManager.strOpToOp(AppOpsManager.java:1624)
at android.app.AppOpsManager.checkOp(AppOpsManager.java:1646)
at com.windowmanager.demo.util.MIUIUtils.isFloatWindowOpAllowed(MIUIUtils.java:73)
at com.windowmanager.demo.compat.WindowManagerPermissionCompat$MIUIRomCompatImpl.hasFloatWindowPermission(WindowManagerPermissionCompat.java:163)
at com.windowmanager.demo.compat.WindowManagerPermissionCompat.hasFloatWindowPermission(WindowManagerPermissionCompat.java:198)
at com.windowmanager.demo.addons.settings.WindowManagerActivity.onCreate(WindowManagerActivity.java:92)
at android.app.Activity.performCreate(Activity.java:6041)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1109)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2285)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2394)
at android.app.ActivityThread.access$800(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5276)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908)

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