Please check your service index…
if the entry for the webscript is there or not…
if not check the log might the webscript wasn't added successfully.
u can check your index of webscript using localhost:<port>/alfresco/service/index/
if entry is there for update then the webscript was ok…but problem with the url u passing…
here you dont have included the upload.get…and url refering to get so server will not able to find the same instead post is there..so also included all get.js,desc and ftl and then try to run