Just i am placing rad controls in design. i got this error... but its functionality is working....
(using Rad controls for asp.net ajax Q3 2009) .i copied all dll in my bin folder & toolbox.
i missed anything ?...thx. in advance...
Does this occur every time you create a new page and drag the controls on to it? Also, have you tried restarting Visual Studio to see if the errors still occur? If they are persistent then you can try to remove the RadControls references from the Global Assembly cache and then re-add them. You can find examples of how to do this in the Add/Remove RadControls to the Global Assembly Cache documentation article. Re-adding them in this way should take care of any design-time errors.