JRebel: Server responded with an error: ERR_UNKNOWN_REBEL_ID

After changing rebel-remote.xml id I was getting the below error in Eclipse when trying to to sync jrebel.

Server responded with an error: ERR_UNKNOWN_REBEL_ID

It looks like the same problem will occur if you forget to deploy your app containing the xml like someone posted before. but in my case this was related to a cache issue that I resolved deleting the cache with the command below and restarting tomcat:

rm -fr /Users/nestor/.jrebel/cache