Unable to add window -- token null is not valid; is your activity running?

[lylzwsy]

2020-03-06 13:43:53.586 3619-3675/? E/XgStat: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?
at android.view.ViewRootImpl.setView(ViewRootImpl.java:798)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:356)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:93)
at android.app.Dialog.show(Dialog.java:329)
at com.beefe.picker.PickerViewModule.show(PickerViewModule.java:386)
at java.lang.reflect.Method.invoke(Native Method)
at com.facebook.react.bridge.JavaMethodWrapper.invoke(JavaMethodWrapper.java:363)
at com.facebook.react.bridge.JavaModuleWrapper.invoke(JavaModuleWrapper.java:162)
at com.facebook.react.bridge.queue.NativeRunnable.run(Native Method)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:31)
at android.os.Looper.loop(Looper.java:193)
at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(MessageQueueThreadImpl.java:194)
at java.lang.Thread.run(Thread.java:764)

in React-Native 0.47.1 targetSdkVersion=26 "react-native-picker": "^4.1.2"
I have this problem.Please help me to solve this problem.
Thanks!