TIdMessage.LoadFromStream: Missing fields

[BartKindt]

I tried to re-compile the Indy10 included in the latest RAD Studio 11.3
I got an error:
[Fatal Error] Cannot compile package 'IndySystem280' which is currently required by RAD Studio 11.

I have now downloaded the entire Indy10 from Github.
I load the file: Indy280.groupproj
Loads normally.
But I cannot compile it at all. I immediately get the compiler error:
[Fatal Error] Cannot compile package 'IndySystem280' which is currently required by RAD Studio 11.

I don't understand what is going on. I never had problems before compiling a downloaded version of Indy10.