构建错误：'System.Array'不包含'Columns'的定义，

I am using SubSonic 2.1 for my web application. It's been working fine until recently I added a table in my SQL Server 2005 database to store user files (such as MS Word, PDF, Jpeg, Gif, Tiff files). The files are stored in a column called ReportFile varbinary(max).I am using SubSonic 2.1 for my web application.