Problem related to SQL server 2005

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database

I am working on Stored Procedure generator Project on .NET and SQL server 2008.

In that I check whether the given column is Primary key or not. Fot that I Used
SQLSERVER.SMO namespace.

Project works properly on my machine but gives error on machine on which SQL server 2005.
The Error is like this .....
"Property Schema is not define for available database."
"If I used dbo.databaseName then object reference is not allowed null!"

Before some time this error was not fired......


Give me solution as soon as possible.....plssssssss