Error while execute command rpm -U

[Mr. T]

I want to install Plesk 8.0.1 on my server ( Cent-OS 4.2) when i do this i get an error later in the process.

Error while execute command rpm -U /root/psa/PSA_8.0.1/update-rpm-CentOS-4.2-i386/selinux-policy-targeted-1.17.30-2.126.noarch.rpm
ERROR: error while executing RPM
ERROR: Installation failed

Does someone know this problem and can help me?!

thanks allready!