IllegalStateException: View android.widget.LinearLayout as already been added to the window manager

@05-27 15:39:32.884 12472-12472/io.silvrr.installment E/AndroidRuntime: FATAL EXCEPTION: main
Process: io.silvrr.installment, PID: #12472
java.lang.IllegalStateException: View android.widget.LinearLayout{a4c9269 V.E...... ......I. 0,0-0,0} has already been added to the window manager.
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:328)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:94)
at android.widget.Toast$TN.handleShow(Toast.java:508)
at android.widget.Toast$TN$1.handleMessage(Toast.java:412)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6858)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:537)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

**how fix this exception？**