El modulo era redundante en la herencia

lib/zoholib/authorization_request.rb

@@ -5,7 +5,7 @@ require 'launchy'
 require 'socket'
 
 module Zoholib
-    class AuthorizationRequest < Zoholib::ZohoRequest
+    class AuthorizationRequest < ZohoRequest
 
         # Sin en algun momento se quiere evitar el encode de URL
         # he aqui un truco

lib/zoholib/grant_request.rb

 #require './lib/zoho_request'
 module Zoholib
-    class GrantRequest < Zoholib::ZohoRequest
+    class GrantRequest < ZohoRequest
 
         #base_uri "https://accounts.zoho.com/oauth/v2/token"
         #headers: {"Authorization" => "Token token=\"111\""}

lib/zoholib/refresh_request.rb

 #require './lib/zoho_request'
 module Zoholib
-    class RefreshRequest < Zoholib::ZohoRequest
+    class RefreshRequest < ZohoRequest
 
         # Sin en algun momento se quiere evitar el encode de URL
         # he aqui un truco