wsnavigator call was terminated because the corresponding servic

hi,

After creating my web service I used the transaction soamanager to test my service but when I click on open web service navigator for selected binding to an error in the browser :

local:8000/wsnavigator call was terminated because the corresponding service is not available.

Note

The termination occurred in system ECC with error code 404 and for the reason Not found.

The selected virtual host was 0 .

thank you for your help