asp.net ajxa RadEditor problem

I put one radeditor on usercontrol like below

    </Content>
    <ImageManager ViewPaths="~/Editor/Img/UserDir/Marketing,~/Editor/Img/UserDir/PublicRelations"
        UploadPaths="~/Editor/Img/UserDir/Marketing,~/Editor/Img/UserDir/PublicRelations"
        DeletePaths="~/Editor/Img/UserDir/Marketing,~/Editor/Img/UserDir/PublicRelations">
    </ImageManager>
</telerik:RadEditor>

but ContentFilters="ConvertCharactersToEntities" this property of radediotor开发者_Python百科 gives me error

Cannot create an object of type 'Telerik.Web.UI.EditorFilters' from its string representation 'ConvertCharactersToEntities' for the 'ContentFilters' property.

how can i solve this error

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It seems that you are using an older version of RadEditor which does not offer the ConvertCharactersToEntities filter. The recommended approach is to migrate to the latest one Q3 2011 SP1 to solve the problem.

Regards, Rumen