It is not an error. It is only for your information.
For older Linux distributions running in a VM, VMware Tools includes a VMware SVGA driver for use by the operating system's X server, and the VMware Tools install script has the job of installing that driver into the guest OS and configuring the X server to use it.
Modern Linux distributions -- including CentOS 6 -- will include a xorg-x11-drv-vmware driver bundled into the OS. (Debian derivatives call it xserver-xorg-video-vmware.) Because the guest OS includes its own VMware SVGA X driver, VMware Tools does not need to install one, and does not need to configure the X server to use that driver. The guest OS has already set that up.
For any modern Linux distribution as a guest, the message you are seeing is perfectly normal and can be ignored.
Hope this helps!
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Darius