android - Xamarin Forms Java.Lang.IllegalArgumentException: DrawerLayout must be measured with MeasureSpec.EXACTLY -

i'm using auth0 xamarin forms pcl library. have following mainpage class :

namespace loginpattern {     public class mainpage : masterdetailpage     {         public mainpage ()         {             master = new menupage ();             detail = new detailpage ();         }     } } 

and following in application class

public app () {        current = this;      login (); }  public void showmainpage () {        mainpage = new mainpage (); }  public async void login () {     await dependencyservice.get<iauth0widgetlogin>().loginuseauth0embeddedwidget();     app.current.properties["isloggedin"] = true;      showmainpage (); } 

hence upon login, i'm not loading page except auth0 login widget. upon successful login display masterdetailpage. getting following error : java.lang.illegalargumentexception: drawerlayout must measured measurespec.exactly.

please advise if need load widget in navigationpage , how so.

edit 17/7 :

public class menupage : contentpage     {         masterdetailpage master;          tableview tableview;          public menupage ()         {             title = "loginpattern";             icon = "slideout.png";              var section = new tablesection () {                 new textcell {text = "sessions"},                 new textcell {text = "speakers"},                 new textcell {text = "favorites"},                 new textcell {text = "room plan"},                 new textcell {text = "map"},             };              var root = new tableroot () {section} ;              tableview = new tableview ()             {                  root = root,                 intent = tableintent.menu,             };              var logoutbutton = new button { text = "logout" };             logoutbutton.clicked += (sender, e) => {                 app.current.logout();             };              content = new stacklayout {                 backgroundcolor = color.gray,                 verticaloptions = layoutoptions.fillandexpand,                 children = {                     tableview,                      logoutbutton                 }             };         }       }   public class detailpage : contentpage {     public detailpage ()     {         backgroundcolor = new color (0, 0, 1, 0.2);          var text = "slide > see master / menu";          if (device.os == targetplatform.android) {             text = @"click action bar dots see master / menu";         } else if (device.os == targetplatform.winphone) {             text = @"click button \/ see master / menu ";         }          content = new stacklayout {              horizontaloptions = layoutoptions.center,             padding = new thickness (10, 40, 10, 10),             children = {                  new label { text = text }             }         };     } } 

i try doing 2 things:

1. setting mainpage of application blank page (or splash page) before attempt display authentication widget.
2. setting explicit width request on menupage.