Cannot find setclasspath.sh when starting up Tomcat 7

In attempting to start Tomcat 7 on my MacBook Pro on El Capitan, I was getting the following error:

amp-macbook:Cellar anton$ catalina start
Cannot find /usr/local/Cellar/tomcat7/7.0.63/libexec/bin/setclasspath.sh
This file is needed to run this program

I found the issue to be due to my CATALINA_HOME environment variable. To resolve this, just do the following from your terminal:

unset CATALINA_HOME

That’s it!