I had developed a custom tool to create components on Tridion. Using core service i am creating the components. I tested this application using small text files, it worked fine. Now i am running my tool to create components for the actual content. For second file it is giving following error: "The formatter threw an exception while trying to deserialize the message: There was an error while trying to deserialize parameter http://www.sdltridion.com/ContentManager/CoreService/2011:deltaData. The InnerException message was 'There was an error deserializing the object of type Tridion.ContentManager.Data.IdentifiableObjectData. Reference to undeclared entity 'nbsp'. Line 21, position 12.'. Please see InnerException for more details.
My file contains a 'nbsp' in between. Schema for which this component is getting created is a single field of type RTF.
Please suggest me how to resolve this issue.
thanks in advance