Autocomplete not firing after uploading to server

Hi

I have a text box with an associated autocompleteextender and web service .asmx page that work correctly on my development machine.  I publish to a subdirectory on my machine and then upload the files to my website on the server.

Unfortunately, the autocomplete does not respond on the server.  I get 2 errors (using F12) as follows.

POST MsAjaxJs?v=D6VN0fHlwFSIWjbVzi6mZyE9Ls-4LNrSSYVGRU46XF81:1 POST http://pictures.jerripediabmd.net/WebService.asmx/Get_Image_Names 500 (Internal Server Error) MsAjaxJs?v=D6VN0fHlwFSIWjbVzi6mZyE9Ls-4LNrSSYVGRU46XF81:1

Uncaught TypeError: Cannot read property 'webServiceFailedNoMsg' of undefined
at Array.it (MsAjaxJs?v=D6VN0fHlwFSIWjbVzi6mZyE9Ls-4LNrSSYVGRU46XF81:1)
at MsAjaxJs?v=D6VN0fHlwFSIWjbVzi6mZyE9Ls-4LNrSSYVGRU46XF81:1
at Sys.Net.WebRequest.completed (MsAjaxJs?v=D6VN0fHlwFSIWjbVzi6mZyE9Ls-4LNrSSYVGRU46XF81:1)
at XMLHttpRequest._onReadyStateChange (MsAjaxJs?v=D6VN0fHlwFSIWjbVzi6mZyE9Ls-4LNrSSYVGRU46XF81:1)

Any suggestions as to where I need to look to find/correct this problem?

Thanks in advance.