The expression prefix 'SPUrl' was not recognized | Pictures not showing up

Jul 30, 2014 at 8:28 AM

I deployed and activated the webpart successfully.
I do have this message:
The expression prefix 'SPUrl' was not recognized. Please correct the prefix or register the prefix in the section of configuration.

What's the 'SPUrl' prefix ?

Any help would be appreciated. Thanks
Aug 17, 2014 at 3:41 AM
hi, only Works in SharePoint server not in foundation...