Error in Using Integrate Tool in Geoprocessing

Hello everyone,

I run into error "Attempted to read or write protected memory. This is often an indication that other memory is corrupt." when I use Integrate tool as follows:


Public Sub Clean(ByVal inputShapefilePath As String, ByVal maxWidth As Double, ByVal maxWidthUnit As String)
Dim geoprocessor As ESRI.ArcGIS.Geoprocessor.Geoprocessor = New ESRI.ArcGIS.Geoprocessor.Geoprocessor()
' geoprocessor.OverwriteOutput = True

Dim workspaceFactory As ESRI.ArcGIS.Geodatabase.IWorkspaceFactory = New ESRI.ArcGIS.DataSourcesFile.ShapefileWorkspaceFactoryClass
Dim workspace As ESRI.ArcGIS.Geodatabase.IWorkspace = workspaceFactory.OpenFromFile(System.IO.Path.GetDirectoryName(inputShapefilePath), 0)
Dim featureWorkspace As ESRI.ArcGIS.Geodatabase.IFeatureWorkspace = CType(workspace, ESRI.ArcGIS.Geodatabase.IFeatureWorkspace) ' Explict Cast
Dim featureClass As ESRI.ArcGIS.Geodatabase.IFeatureClass = featureWorkspace.OpenFeatureClass(System.IO.Path.GetFileNameWithoutExtension(inputShapefilePath))

'create a new instance of a integrate tool
Dim integrateTool As New Integrate(featureClass)

' integrateTool.cluster_tolerance = CStr(maxWidth) & " " & maxWidthUnit
'Run integrate tool
geoprocessor.Execute(integrateTool, Nothing)
End Sub

Thanks for any help,

Some additional info:
1. The polygon shapefile should be fine since I can add it into ArcMap and the Integrate tool in ArcMap's toolbox works fine on it;
2. I'm using ArcGIS 10.1 on Windows 7