Sharepoint 2010

Apr 7, 2011 at 3:45 PM

Hello. We are using Lookup with Picker on our current Sharepoint 2007 server and planning to upgrade to Sharepoint 2010. I've tried to install it on clean Sharepoint 2010 but when I try to add a new clumn of this type I get the error 

Could not load file or assembly "Microsoft.SharePoint.ApplicationPages, Version=, Culture=neutral, PublicKeyToken=71e9bce111e9429c" or one
of its dependencies. The located the definition of an assembly manifest does not match the assembly reference . (Исключение из HRESULT: 0x80131040)

Can this component be used with Sharepoint 2010 or how can I change the field to another type without data loss?

Thanks in advance