How do I solve Xamarin.Forms.Xaml.XamlParseException

I am new to Xamarin Forms and C# too. Kindly help me to get rid of the above issue.

I am getting Xamarin.Forms.Xaml.XamlParseException while I am trying to add the string format of my selected image source to CandidateDetails,cs.

The pages are as follow:

CandidateDetails.cs
public event PropertyChangedEventHandler PropertyChanged;

        private string imageBase64;
        public string ImageBase64
        {
            get { return imageBase64; }
            set
            {
                imageBase64 = value;
                OnPropertyChanged("ImageBase64");
                CandImage = Xamarin.Forms.ImageSource.FromStream(
                    () => new MemoryStream(Convert.FromBase64String(imageBase64)));
            }
        }
        private Xamarin.Forms.ImageSource _candImage;
        public Xamarin.Forms.ImageSource CandImage
        {
            get { return _candImage; }
            set
            {
                _candImage = value;
                OnPropertyChanged("CandImage");
            }
        }

        public string _candName;
        public string CandName
        {
            get { return _candName; }
            set
            {
                if (_candName == value)
                    return;

                _candName = value;

                OnPropertyChanged(CandName);

            }
        }

        public string _candInst;
        public string CandInst
        {
            get { return _candInst; }
            set
            {
                if (_candInst == value)
                    return;

                _candInst = value;

                OnPropertyChanged(CandInst);

            }
        }

        public string _candEmailId;
        public string CandEmailId
        {
            get { return _candEmailId; }
            set
            {
                if (_candEmailId == value)
                    return;

                _candEmailId = value;

                OnPropertyChanged(CandEmailId);

            }
        }

        public string _candMob;
        public string CandMob
        {
            get { return _candMob; }
            set
            {
                if (_candMob == value)
                    return;

                _candMob = value;

                OnPropertyChanged(CandMob);

            }
        }

        private void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

CandidateDetailsModalPage.xaml.cs

    public partial class CandidateDetailsModalPage : ContentPage
    {
        Stream input;
        string imageAsString;

        public static ObservableCollection<CandidateDetails> _candidate = new ObservableCollection<CandidateDetails>();
        async void OnDoneClicked(object sender, System.EventArgs e)
        {
            _candidate.Add(new CandidateDetails
                {

                    CandName = (string)candNameEntry.Text,
                    CandEmailId = (string)candEmailId.Text,
                    CandMob = (string)candMobNumber.Text,
                    ImageBase64 = imageAsString

                });


                await Navigation.PopModalAsync();

        }


        public CandidateDetailsModalPage()
        {
            InitializeComponent();

            pickPhoto.Clicked += async (sender, args) =>
        {
                        if (!CrossMedia.Current.IsPickPhotoSupported)
            {
                await DisplayAlert("Photos Not Supported", ":( Permission not granted to photos.", "OK");
                return;
            }
            var file = await CrossMedia.Current.PickPhotoAsync(new Plugin.Media.Abstractions.PickMediaOptions
            {
                PhotoSize = Plugin.Media.Abstractions.PhotoSize.Medium
            });
                        if (file == null)
                return;
                        input = file.GetStream();
                        byte[] buffer = new byte[16 * 1024];
            using (MemoryStream ms = new MemoryStream())
            {
                int read;
                while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
                {
                    ms.Write(buffer, 0, read);
                }
                        imageAsString = Convert.ToBase64String(ms.ToArray());
            }
                        //image.Source = ImageSource.FromStream(() => new MemoryStream(Convert.FromBase64String(imageAsString)));
                    image.Source = ImageSource.FromStream(() =>
        {
        var stream = file.GetStream();
        file.Dispose();
        return stream;
        });
                    };
                }
            }

CandidateDetailsModalPage.xaml

    <StackLayout Orientation="Vertical" BackgroundColor="#3B4371" Padding="0">
        <Button Text="Done" Clicked="OnDoneClicked" />
       <ic:CircleImage x:Name="image Aspect="AspectFill"/>
        <Button x:Name="pickPhoto" Text="Pick Photo"/>
            <StackLayout VerticalOptions="FillAndExpand">
                <Entry x:Name="candNameEntry" Placeholder="Candidate Name"/>
                <Entry x:Name="candInst" Placeholder="Candidate Institution / Party"  />
                <Entry x:Name="candEmailId" Placeholder="Candidate Email Id" Keyboard="Email"/>
                   <Entry x:Name="candMobNumber" Placeholder="Candidate Mobile Number" Keyboard="Telephone"  />
            </StackLayout>
      </StackLayout>

The following is the backend of the xaml page where I am displaying the data
CandidateDisplayPage.xaml.cs

candidateListView.ItemsSource = CandidateDetailsModalPage._candidate;
CandidateDisplayPage.xaml

<ListView x:Name="candidateListView">
    <ListView.ItemTemplate>
        <DataTemplate>
            <ViewCell>
                <StackLayout Orientation="Horizontal">
                    <Image x:Name="candImage" ImageSource="{Binding Path=CandImage}"/>
                    <Label Text="{Binding CandName}" x:Name="candName"/>
                </StackLayout>
            </ViewCell>
        </DataTemplate>
    </ListView.ItemTemplate>
</ListView>