How to upload an rdl from SSRS in SSQL Server

Hi,

According to a number of places on the web, to add a custom report in SQL Server, you just have to go to Reports to custom reports then add you rdl.

However, when I do that I get the following message, which I am not sure what it means or what I can do about it.

Error message:

"Object reference not set to an instance of an object. (Microsoft.SqlServer.Management.Reports)"

Any ideas would be really appreciated.

Thank you

Ed