webResource error

[July]

The company , where i work, bought the telerik pack.
I was using telerik.ui.dll trial, after I add the dll boughted I have the following error:





I create the ribbonbar programmatically...
I known that error is on ribbonbar, because if I comment the line  where created the error disapear.

I only add this on my css

div.RadRibbonBar{ width:100% !important}
* + html  div.RadRibbonBar{ width:100% !important}
* + html div.RadRibbonBar .rrbButtonAreaIn {width: 100% !important;}

div.RadRibbonBar div.rrbButtonGroup.CommunityCustom {width: 90px!important; }        
div.RadRibbonBar div.rrbButtonGroup.FolderCustom {width: 210px!important; }   
div.RadRibbonBar div.rrbButtonGroup.DocumentCustom {width: 160px!important;}         
div.RadRibbonBar div.rrbButtonGroup.ViewCustom {width: 400px!important;}        


I tried remove this css, but the error persist