Created Unassigned: XamlParseException at runtime on DateTimePicker [21175]

Hi,

I'm implementing the DateTimePicker in my project, using the toolkit.

However it complies without any issue on the namescpace, when I start the project, I have a XamlParseException on the Xaml tag <xctk:DateTimePicker>... telling me that it could not load the File or assembly Xceed....

I tried several things, such as deleting the XML namespace définitions in the XCeed Toolkit source project AssemblyInfo.cs, but wihtout any success....

Can someone help me ont this point ?

Thanks.