Have a look at this page, underneath the "Phase Order" heading. That should let you know how you need to define the Dispatch phase in your axis2.xml.
It's also possible that the axis2.xml file can't be found or is missing. You haven't provided many details so it's hard to be more specific than that.
Edit:
Remember that Axis2 is a standalone web application that is deployed into a servlet container.
You indicated in your comments that you modified your web application's web.xml. You should not need to do that to get Axis2 to work properly, so you can remove those mappings and redeploy your applications.
Try this guide. Make sure that you can see the "Axis2 Happiness" page described in step 6.
Once you have that working, you can go back to your other web applications and start modifying them to call your web services.