I want to collect texture maps through it,I write all my codes in c#.But report an error!

<span class="lia-message-image-wrapper lia-message-image-actions-narrow lia-message-image-actions-below"><img class="lia-media-image" title="_20240220105721.jpg" src="https://forums.autodesk.com/t5/image/serverpage/image-id/1327991iAD244F57917253E1/image-size/medium?v=v2&px=400" alt="_20240220105721.jpg" /></span>

the following is my codes:

private void PasteFeedBack_Click(object sender, RoutedEventArgs e)
{
try
{
SRYAssetEnumCallback Addmap = new SRYAssetEnumCallback();
GlobalInterface.Instance.COREInterface.EnumAuxFiles(Addmap, 0);
}
catch (Exception ex) { MessageBox.Show(ex.Message); }
}

--------------

public class SRYAssetEnumCallback : IAssetEnumCallback
{
private List<string> NameList = null;
private static List<string> PathList = null;
public List<string> BitmapPaths
{
get { return PathList; }
set { PathList = value; }
}

public IntPtr NativePointer => throw new NotImplementedException();

public void Dispose()
{
throw new NotImplementedException();
}

public bool Equals(IAssetEnumCallback other)
{
throw new NotImplementedException();
}

public void RecordAsset(IAssetUser asset)
{
if (!NameList.Contains(asset.FileName))
{
NameList.Add(asset.FileName);
PathList.Add(asset.FullFilePath);
}
}
}