Error when I tap Sign up

[creepteks]

I get the following error when I tap on sign up:
System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.

when I debug the app, the debugger stops at the following line, throwing the error:
NavigationService>CreateAndBindPage>line 162 which is :

page.BindingContext = viewModel;

CreateAndBind does its job on other viewModels, just not the signUpViewModel; and I honestly donno what's goin on!

PS: I did what was discussed in the #2 . it still is broken.