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Unknown operation string: android:system_alert_window
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)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703)