Getting ion

I am having one java application through which I am consuming one web service.

But surprising thing is that on a local machine I am able to consume that web service but same code does not work with our UAT machines and throws error

Error :runtime modeler error: Wrapper class com.iwave.operations.jaxws.IncidentGet is not found. Have you run APT to generate them?

I really have no idea ,why it is happening.

It is working fine on some of the machines.but on few machines it is trwoing the above error...
So any idea..???
Is it the JAVA version problem..I am using the jdk6u17 version...
Please help me..