Hi Apu
First of all, please confirm that you are using the correct NWDS version for your system
Stop using the wrong NWDS version! © - Have a smoother Eclipse experience
Secondly, Excel2XMLTransformer is no longer a standalone module and needs to be executed via FormatConversionBean. I see that FormatConversionBean.java and it's related dependencies are not included in your project.
Lastly, if you still cannot resolve the issue, I'd suggest that you follow the steps on the following post to setup the project correctly. This ensures everything is in place.
Setup com.equalize.xpi.af.modules Adapter Module project in NWDS easily using EGit
Regards
Eng Swee