If you add Head as well as Get then this error will go away and the spider will read your site correctly. As Nathan said, you could turn them off, but you're not fixing the issue really, just ignoring it and you might lose out if spiders cannot read your site 100%
This should work, get fiddler out and try it!
[AcceptVerbs(HttpVerbs.Get | HttpVerbs.Head)]
public ActionResult Test()
{
return View();
}