Error in calling webservices in autocomplete jquery (combo)

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ASP.NET

Hi All


I am trying to implement webservices in jquery autocomplete(http://jqueryui.com/autocomplete/#combobox[^]

refer to this ..


Now I am calling my webservices using ajax fucntion

$.ajax({
                   type: "POST",
                   url: "WebService1.asmx?op=GetOwner",
                   data: "{prefixText}",
                   async: false,
                   contentType: "application/json; Characterset=utf-8",
                   dataType: "json

In json format but I am getting

Error ": 500 internal server not found , when we search on text box ...

Please help