Technology Errors

Cacti Graphs Not Displaying, [STDERR] sh: /usr/bin/rrdtool: No such file or directory

I was contacted by a client last week regarding a monitoring server they have deployed. One of the applications they have gathering data from this server is Cacti. Anyhow they were able to login to Cacti but the graphs were not displaying. After logging into the server, which is running CentOS Linux, I saw the error clearly in the Litespeed logs. Below I describe the error in more detail as well as how to resolve this problem if you run into it.