I am new to StackExchange so please bear with my eventual mistakes...
I have been searching for answers but none seem to apply to my situation being that that build
You will get this error if you already have an instance deployed to the Tomcat server. You can set update="true" in the tomcatdeploy:
update="true"
tomcatdeploy
Another option is to explicitly undeploy and then redeploy, or use the reload tag instead of the deploy tag.
reload