Fatal Exception: java.lang.IllegalStateException

Hi, my app crashes due to library.
I am using the library version 2.2.0:
Here is a crash log:

Fatal Exception: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
       at android.view.ViewGroup.addViewInner(ViewGroup.java:5477)
       at android.view.ViewGroup.addView(ViewGroup.java:5296)
       at android.view.ViewGroup.addView(ViewGroup.java:5268)
       at com.android.internal.policy.PhoneWindow.addContentView(PhoneWindow.java:591)
       at fr.tvbarthel.lib.blurdialogfragment.BlurDialogEngine$BlurAsyncTask.onPostExecute(BlurDialogEngine.java:610)
       at fr.tvbarthel.lib.blurdialogfragment.BlurDialogEngine$BlurAsyncTask.onPostExecute(BlurDialogEngine.java:550)
       at android.os.AsyncTask.finish(AsyncTask.java:771)
       at android.os.AsyncTask.-$$Nest$mfinish(AsyncTask.java)
       at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:788)
       at android.os.Handler.dispatchMessage(Handler.java:106)
       at android.os.Looper.loopOnce(Looper.java:226)
       at android.os.Looper.loop(Looper.java:313)
       at android.app.ActivityThread.main(ActivityThread.java:8757)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1067)

Can you please fix it?
Thanks.