Undeclared identifier: 'TIdAttachment'

Hi

I m trying to install a Delphi application on another pc, but I m having problems and get the error: Undeclared identifier: 'TIdAttachment'.

Since this is a functionality of 'IdMessage' which is included at the 'uses' part I dont understand what the problem is.
I still got that other pc where it is working though and i looked at the differances and found that the Indy driver differs. On the pc where its working its 9.0.50 and on the other where it isnt working the version is 10.0.20

I tried to install the 9.0.50 version on my new pc but apperantly this isnt solving the problem. Maybee i ve overlooked something but can anyone please give me a suggestion where to look to solve this??

many thanks! Marcel

okay found the problem... I used a differant version of Indy. I used 10 and apparently this wasn't compatible with version 9. So I installed the package and changed the Library paths to version 9.