Ambiquity between method why? warning

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C#

ASP.NET

Warning 1
Ambiguity between method 'Microsoft.Office.Interop.Word._Document.Close(ref object, ref object, ref object)' and non-method 'Microsoft.Office.Interop.Word.DocumentEvents2_Event.Close'. Using method group.

Warning 2
Ambiguity between method 'Microsoft.Office.Interop.Word._Application.Quit(ref object, ref object, ref object)' and non-method 'Microsoft.Office.Interop.Word.ApplicationEvents4_Event.Quit'. Using method group.

object missing = Missing.Value;
object start1 = 0;

var wordApp = new Microsoft.Office.Interop.Word.Application();

var myDoc = wordApp.Documents.Add(ref missing, ref missing, ref missing, ref missing);

object doNotSaveChanges = WdSaveOptions.wdDoNotSaveChanges;
Range rng = myDoc.Range(ref start1, ref missing);

try
{
    const char newLine = (char)11;
    myDoc.SaveAs(ref fs,
                 ref missing, ref missing, ref missing, ref missing, ref missing,
                 ref missing, ref missing, ref missing, ref missing, ref missing,
                 ref missing,
                 ref missing,
                 ref missing, ref missing, ref missing);
myDoc.Save();

    myDoc.Close(ref doNotSaveChanges, ref missing, ref missing);
    
    wordApp.Quit(ref doNotSaveChanges, ref missing, ref missing);
    System.Runtime.InteropServices.Marshal.ReleaseComObject(myDoc);   
    System.Runtime.InteropServices.Marshal.ReleaseComObject(wordApp);
    GC.Collect();