BpmnError not showing in UI

Dear friends,

In my service task i am calling a class that extends JavaDelegate.

If my class throwing an BPNM error ,i am catching in error boundary event.

But the error message is not showing in the UI(Flowable UI).

catch ( final Exception e ) {
System.out.print(“Not Same”);

	throw new BpmnError("ERROR-OCCURED");

Can any one help me on this please…

Kind Regards