Cannot see Axis2 webservices in the URL

[Cyril Furtado]

I use Tomcat
I used the axis2.xml as given from the axis2 1.4.1 release
After deploying the services
And I check the URL for the service I see  Http 500 (Server Error)
Looking at the log I can see
"Did not find RequestResponseTransport cannot set response written"

What am I missing?
Cyril