c# - Acr.UserDialogs problems in UWP -

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i have added uwp xamarin-project, wierd behavior acr.userdialogs.

when using promptasync , confirm argumentnullexception.
how can fix these?

the other problem is, successtoast never disappears on ios , android, , did on silverlight.
there workaround this?

i using these nuget packages (in uwp project)

acr.userdialogs                              v5.2.2 acr.xamforms.userdialogs                     v5.0.0 microsoft.netcore.universalwindowsplatform   v5.1.0 mr.gestures                                  v1.3.4 sqlite.net-pcl                               v3.1.1 xam.plugins.settings                         v2.1.0 xamarin.forms                                v2.2.0.45 xamarin.insights                             v1.12.3 xlabs.forms                                  v2.2.0-pre02

i hope help.

update
stacktrace figured out, have set placeholder string.empty, per default set null, uwp not support.


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