APPTestLite tool problem

Hi

I am testing my application for symbian signed test by AppTestLite(ATL) tool . My SIS file is signed by developer certificate but not signed with ACS Id.

After copying the file in "!:\symbiansigned\myapp.sisx" ATL tool stars & records me application activities. But on Test #PKG-02 it aborts.
It displays the error message "Testing abort" check log files.

In Log files :
error    PKG-02  Can be installed and started.
                 Error in testing (KErrNotFound). Test case not completed.

Please help ... what i am doing wrong.
Is it necassary to sign the SIS file with ACS ID also to run the application on ATL(AppTestLite)tool??

Thanxs in advance.
Cheers.