Requested factory com.ctc.wstx.stax.WstxOutputFactory cannot be located

i am trying to generate webservice client using axix2 on eclipse so i followed the tutorial here: http://ift.tt/1DxkLVi

but at the last step when clicking finish, i am getting the error:

Exception occurred during code generation for WSDL  : javax.xml.stream.FactoryConfigurationError: Requested factory com.ctc.wstx.stax.WstxOutputFactory cannot be located.  Classloader =org.eclipse.osgi.internal.framework.ContextFinder@2de030

so i downloaded : wstx-asl-4.0.0.jar and added it to the build path of the project, but still keep getting same error.

please advise how to fix this issue.