ServiceException -- Unable to complete operation

JudyTroutwine

I am testing a simple bare bones Geoprocessing project and keep getting the
ESRI.ArcGIS.Client.Tasks.ServiceException error.  The model is as simple as can be -- just one string parameter.  What could be the issue?  Here is the code:

The XAML:

<UserControl x:Class="GPpoint.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:esri="http://schemas.esri.com/arcgis/client/2009"        
    xmlns:sys="clr-namespace:System;assembly=mscorlib"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">

    <Grid x:Name="LayoutRoot" Background="White">
        <Grid.Resources>
            <esri:SimpleMarkerSymbol x:Key="StartMarkerSymbol" Color="Red" 
                  Style="Triangle" Size="8" />
            <esri:SimpleFillSymbol x:Key="DefaultFillSymbol" Fill="#99FF9999" BorderBrush="#FFFF9999" BorderThickness="2"  />
        </Grid.Resources>

        <esri:Map x:Name="MyMap" Background="White" MouseClick="MyMap_MouseClick">
            <esri:Map.Extent >
                <esri:Envelope XMin="846500" YMin="982350" XMax="850600" YMax="986500" >
                    <esri:Envelope.SpatialReference>
                        <esri:SpatialReference WKID="2256"/>
                    </esri:Envelope.SpatialReference>
                </esri:Envelope>
            </esri:Map.Extent>

            <esri:ArcGISDynamicMapServiceLayer ID="CampAb"
                     Url=myURL/>
        </esri:Map>

    </Grid>
</UserControl>

The code behind:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using ESRI.ArcGIS.Client;
using ESRI.ArcGIS.Client.Geometry;
using ESRI.ArcGIS.Client.Tasks;
using ESRI.ArcGIS.Client.Symbols;

namespace GPpoint
{
    public partial class MainPage : UserControl
    {
        Geoprocessor _geoprocessorTask;

        public MainPage()
        {
            InitializeComponent();
            _geoprocessorTask = new Geoprocessor(http://myserver/arcgis/rest/services/GPServer/GPTest/GPServer);
            _geoprocessorTask.ExecuteCompleted += GeoprocessorTask_ExecuteCompleted;
            _geoprocessorTask.Failed += GeoprocessorTask_Failed;
            _geoprocessorTask.UpdateDelay = 5000;
            _geoprocessorTask.GetInputCompleted +=GeoprocessorTask_GetInputCompleted;
            _geoprocessorTask.ExecuteCompleted += GeoprocessorTask_ExecuteCompleted;
            _geoprocessorTask.GetResultDataCompleted +=GeoprocessorTask_GetResultDataCompleted;
            _geoprocessorTask.StatusUpdated +=GeoprocessorTask_StatusUpdated;
        }

        private void MyMap_MouseClick(object sender, ESRI.ArcGIS.Client.Map.MouseEventArgs e)
        {
            _geoprocessorTask.CancelAsync();


            MyMap.Cursor = System.Windows.Input.Cursors.Wait;
            String pname = "strValue";
            List<GPParameter> parameters = new List<GPParameter>();
            parameters.Add(new GPString("inputValue",pname));

           _geoprocessorTask.OutputSpatialReference = new SpatialReference(2256);
           _geoprocessorTask.ExecuteAsync(parameters);

        }

        private void GeoprocessorTask_ExecuteCompleted(object sender, ESRI.ArcGIS.Client.Tasks.GPExecuteCompleteEventArgs args)
        {
           MessageBox.Show("ExecuteCompleted");
            MyMap.Cursor = System.Windows.Input.Cursors.Hand;
        }

        private void GeoprocessorTask_GetInputCompleted(object sender, GPParameterEventArgs e)  //not raised
        {
            MessageBox.Show("GetInputCompleted");
        }   

        private void GeoprocessorTask_StatusUpdated(object sender, JobInfoEventArgs e)   //not raised
        {
            MessageBox.Show("StatusUpdated");
            MessageBox.Show(e.JobInfo.JobId.ToString());             
            MessageBox.Show(e.JobInfo.JobStatus.ToString());                    
        }

        private void GeoprocessorTask_Failed(object sender, TaskFailedEventArgs e)  //raised
        {
            MyMap.Cursor = System.Windows.Input.Cursors.IBeam;
            MessageBox.Show("Geoprocessor service failed: " + e.Error);
        }
    }
}

JudyTroutwine

Aha, that works!  Thanks much.