More fine-tuning to the new TclKit tools.

FossilOrigin-Name: 43addd8aa04c3faceb9d303672e330294af01a16
diff --git a/tool/GetFile.cs b/tool/GetFile.cs
index 9c489c6..56601f3 100644
--- a/tool/GetFile.cs
+++ b/tool/GetFile.cs
@@ -350,7 +350,7 @@
 

             if (!Uri.TryCreate(args[0], UriKind.Absolute, out uri))

             {

-                Error("First argument is not an absolute URI.", false);

+                Error("Could not create absolute URI from argument.", false);

                 return (int)ExitCode.BadUri;

             }