Unable to install Plesk 8.6.0 to clean CentOS 5.5

[tiarv]

Hello.

# ./parallels_installer_v3.4.1_build090204.18_os_CentOS_5_i386
...

Retrieving information about the installed packages...
Downloading the file PSA_8.6.0/dist-rpm-CentOS-5-i386/build-8.6.0-cos5-i386.hdr.gz: 10%..20%..30%..40%..50%..60%..70%..80%..90%..100% done.
Downloading the file PSA_8.6.0/update-rpm-CentOS-5-i386/update-8.6.0-cos5-i386.hdr.gz: 10%..20%..30%..40%..50%..60%..70%..80%..90%..100% done.
Downloading the file PSA_8.6.0/thirdparty-rpm-CentOS-5-i386/thirdparty-8.6.0-cos5-i386.hdr.gz: 11%..23%..32%..57%..61%..73%..100% done.
Determining the packages that need to be installed.
ERROR: Unable to install the "psa-8.6.0-cos5.build86080722.00.i586 (b 0x919bea8 source=0x8f0c770 P:3868 R:125)" package.

The following could cause the installation failure:
Packages "httpd-2.2.3-22.el5.centos.2.i386 (u 0x9cb33e8 source=0x8f0c860 P:435 R:45)" and "httpd-2.2.3-43.el5.centos.3.i386 (s 0x8cfbb48 source=0x8cc51a8 P:437 R:45)" cannot be installed at the same time

 

[tiarv]

fixed by removing preinstalled httpd, thank you
solved