Has anybody seen this error if so do you know what is the problem ? Thanks !

[Developer Developer]

javax.servlet.ServletException: Servlet execution threw an exception

root cause

java.lang.NoClassDefFoundError: javax/wsdl/OperationType
	org.apache.axis.description.OperationDesc.<clinit>(OperationDesc.java:59)
	org.apache.axis.client.Call.addParameter(Call.java:960)
	org.apache.axis.client.Call.addParameter(Call.java:995)
	test.HelloWorld.callAdd12(HelloWorld.java:95)
	test.HelloWorld.doGet(HelloWorld.java:52)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)