Actions.java:11: error: package com.xxxxx.xxxx does not exist when running script on load generator

I am getting the following error when I run a script that uses java

Actions.java:11: error: package com.xxxxx.xxxx does not exist when running script on load generator

I have included the jar files in the extra files section of the script. 

Script runs fine on the controller.

I have installed jdk and jce policy files as well as added the java bin dir in the system path 

Any tips would be much appreciated.

Thanks in advance.