TextField keyboard not showing

Keyboard not showing for text field on simulator.

A text box has been created.

    txt_UserName = new UITextField {
        Placeholder = "Enter Username",
        BorderStyle = UITextBorderStyle.RoundedRect,
        Font = UIFont.FromName(Constants.KHELVETIC,Constants.KFontSize12),
        VerticalAlignment = UIControlContentVerticalAlignment.Center,
        AutocorrectionType = UITextAutocorrectionType.No,
        AutocapitalizationType = UITextAutocapitalizationType.None,
        ClearButtonMode = UITextFieldViewMode.WhileEditing,
        LeftViewMode = UITextFieldViewMode.Always,
        ReturnKeyType = UIReturnKeyType.Next,
        BackgroundColor = UIColor.White,
        ShouldReturn = delegate {
            txt_Email.BecomeFirstResponder ();
            return true;
            }
        };


    txt_Email = new UITextField {
        Placeholder = "Enter Email",
        BorderStyle = UITextBorderStyle.RoundedRect,
        Font = UIFont.FromName(Constants.KHELVETIC,Constants.KFontSize12),
        VerticalAlignment = UIControlContentVerticalAlignment.Center,
        AutocorrectionType = UITextAutocorrectionType.No,
        AutocapitalizationType = UITextAutocapitalizationType.None,
        ClearButtonMode = UITextFieldViewMode.WhileEditing,
        KeyboardType = UIKeyboardType.EmailAddress,
        LeftViewMode = UITextFieldViewMode.Always,
        ReturnKeyType = UIReturnKeyType.Next,
        BackgroundColor = UIColor.White,
        ShouldReturn = delegate {
            txt_Password.BecomeFirstResponder ();
            return true;
        }
    };

      

        
        
        
      

    

Unable to find keyplane that supports type 5 for iPhone-Portrait-PhonePad keyboard; using 2870935746_Portrait_iPhone-Complex-Pad_Default

Shows the above message when I select the textbox.