Please help me its really urgent...

i want to sign my sis file with ACS publisher id, But it is not getting sign......

I am exporting a .P12 file from the mail received by the TrustCentre, Then i am generating key ans certificate by using tcp12p8 batch file ,But after signing my sis file by using this cer & key when i verify my signed sis
by using “ VerifySymbianSigned_25_05_2007.exe”, It is showing

ACS Publisher Signed  : no
Unknown Certificates  : 1

Please anyone can help me out or suggest where & what is problem in it....

Thanks for your help in advance...