//// Copyright (c) 2007, Brian Frank and Andy Frank// Licensed under the Academic Free License version 3.0//// History:// 24 Nov 07 Brian Frank Creation//**** UnresolvedErr indicates the failure to resolve a Uri to a resource.**const class UnresolvedErr : Err {**** Construct with specified error message and optional root cause.**new make(Str msg := "", Err? cause := null) }