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Autocomplete with jquery json. Internal server error 500?

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The program works on local but not works on server.Why??????

[WebMethod]

public List<string> GetAutoCompleteData(string prefixText)

...

here is the error: Internal server error 500

and also this error:

Server Error in '/' Application.


Unknown web method GetAutoCompleteData.
Parameter name: methodName

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.ArgumentException: Unknown web method GetAutoCompleteData.
Parameter name: methodName

Source Error: 

An unhandled exception was generated during the execution of the current web request.Information regarding the origin and location of the exception can be identified using the exception stack trace below.


Stack Trace: 

[ArgumentException: Unknown web method GetAutoCompleteData.
Parameter name: methodName]
   System.Web.Script.Services.WebServiceData.GetMethodData(String methodName) +539974
   System.Web.Script.Services.RestHandler.CreateHandler(WebServiceData webServiceData, String methodName) +10
   System.Web.Script.Services.RestHandler.CreateHandler(HttpContext context) +159
   System.Web.Script.Services.RestHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated) +62
   System.Web.Script.Services.ScriptHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated) +47
   System.Web.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +334
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +184



Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.272 

Please help

A lot of thanks 

Respect.


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