//// Copyright (c) 2009, Brian Frank and Andy Frank// Licensed under the Academic Free License version 3.0//// History:// 21 Dec 07 Brian Frank Creation// 26 Mar 09 Brian Frank Renamed from UnknownThreadErr//**** UnknownServiceErr indicates an attempt to lookup a service** which is not installed. See `Service.find`.**const class UnknownServiceErr : Err {**** Construct with specified error message and optional root cause.**new make(Str msg := "", Err? cause := null) }