SysReportLibraryExport syntax error

I was installing the following scenario :

AOS Server :
Windows 2008 R2

Database Server:
Windows 2008 R2
SQL Server 2008


After install reporting extension I got the following error when run AxPatch.exe as suggested in this procedure.

Error executing code: SysReportLibraryExport (object) has no valid runable
code in method 'new'.
(C)\Classes\SysReportLibraryExport\new

I tried compile the class from AOS server, it is error.
It turned out that I had to compile the class by opening Ax client from database server as there is where the reporting extension is installed.