Installing graphviz

hi all,

iam trying to install graphviz software on my linux box(suse linux).
i downloaded rpm graphviz-2.9.20060521.0440-1.fc1.i386.rpm
i'm using rpm --install graphviz-2.9.20060521.0440-1.fc1.i386.rpm but getting the errors

warning: user ellson does not exist - using root
warning: group ellson does not exist - using root
warning: user ellson does not exist - using root
warning: group ellson does not exist - using root

please help me out of what to do now...

thanks,

you are getting warnings no errors. did you use rpm -q to if it is installed ?
or simply tried to start graphvis ?