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'No information was found about this pixel format error' on image binding

Posted By:      Posted Date: September 29, 2010    Points: 0   Category :WPF
I've read all the posts I could find on this error but I'm still stumped.

I have a user control with a dependency property named Image.

In the user control I have a stack panel that contains an image and I set the binding in the xaml

<Image HorizontalAlignment="Center" Margin="3,0,0,0" Width="85" Height="75" Source="{Binding ElementName=UserControl, Path=Image}"/>

In a code behind I try to set the image for an instance of this control named WeatherNB

                BitmapImage bi1 = new BitmapImage();
                bi1.UriSource = new Uri(currentImage, UriKind.Relative);
                this.WeatherNB.Image = bi1;

but I get the following error

Unhandled Exception: System.NotSupportedException: No information was found about this pixel format.
   at System.Windows.Media.PixelFormat.CreatePixel

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