Built-in dbExpress Driver problem

Built-in dbExpress Driver problem

I use dbExpress Driver for InterBase and Firebird 6.1  Source code. 
 and Delphi XE

use 
DbxIdaDriverLoader and compile 

An error occurred

[DCC Error] IBCError.pas(29): E2003 Undeclared identifier: 'ECRError'

in unit IBCError;

How to resolve it?

thanks!