diff --git a/lib/syspro/api_resource.rb b/lib/syspro/api_resource.rb
index 19a30c5..a84f25a 100644
--- a/lib/syspro/api_resource.rb
+++ b/lib/syspro/api_resource.rb
@@ -18,6 +18,12 @@ module Syspro
       "/#{CGI.escape(class_name.downcase)}"
     end
 
+    def handle_errors(resp)
+      body = resp[0].http_body
+      raise AuthenticationError, body if body =~ /^(ERROR: The supplied UserID is invalid.)/
+      raise SysproError, body if body =~ /^(ERROR)/
+    end
+
     def refresh
       resp, opts = request(:get, resource_url, @retrieve_params)
       initialize_from(resp.data, opts)
diff --git a/lib/syspro/business_objects/combrw.rb b/lib/syspro/business_objects/combrw.rb
index 5a8787f..44a0be0 100644
--- a/lib/syspro/business_objects/combrw.rb
+++ b/lib/syspro/business_objects/combrw.rb
@@ -34,11 +34,6 @@ module Syspro
         parser = ComBrwParser.new(resp[0].data)
         parser.parse
       end
-
-      def handle_errors(resp)
-        body = resp[0].http_body
-        raise SysproError, body if body =~ /^(ERROR)/
-      end
     end
   end
 end
diff --git a/lib/syspro/business_objects/comfch.rb b/lib/syspro/business_objects/comfch.rb
index 66ce6ea..70fe926 100644
--- a/lib/syspro/business_objects/comfch.rb
+++ b/lib/syspro/business_objects/comfch.rb
@@ -34,11 +34,6 @@ module Syspro
         parser = ComFchParser.new(resp[0].data)
         parser.parse
       end
-
-      def handle_errors(resp)
-        body = resp[0].http_body
-        raise SysproError, body if body =~ /^(ERROR)/
-      end
     end
   end
 end
diff --git a/lib/syspro/business_objects/comfnd.rb b/lib/syspro/business_objects/comfnd.rb
index ec5589e..caf221e 100644
--- a/lib/syspro/business_objects/comfnd.rb
+++ b/lib/syspro/business_objects/comfnd.rb
@@ -29,11 +29,6 @@ module Syspro
         parser = ComFndParser.new(resp[0].data)
         parser.parse
       end
-
-      def handle_errors(resp)
-        body = resp[0].http_body
-        raise SysproError, body if body =~ /^(ERROR)/
-      end
     end
   end
 end
diff --git a/lib/syspro/business_objects/porqry.rb b/lib/syspro/business_objects/porqry.rb
index 7af4570..01ead07 100644
--- a/lib/syspro/business_objects/porqry.rb
+++ b/lib/syspro/business_objects/porqry.rb
@@ -37,11 +37,6 @@ module Syspro
         parser = PorQryParser.new(resp[0].data)
         parser.parse
       end
-
-      def handle_errors(resp)
-        body = resp[0].http_body
-        raise SysproError, body if body =~ /^(ERROR)/
-      end
     end
   end
 end
diff --git a/lib/syspro/business_objects/portor.rb b/lib/syspro/business_objects/portor.rb
index 12f1e0f..05914ab 100644
--- a/lib/syspro/business_objects/portor.rb
+++ b/lib/syspro/business_objects/portor.rb
@@ -40,11 +40,6 @@ module Syspro
         parser = PorTorParser.new(resp[0].data)
         parser.parse
       end
-
-      def handle_errors(resp)
-        body = resp[0].http_body
-        raise SysproError, body if body =~ /^(ERROR)/
-      end
     end
   end
 end
diff --git a/lib/syspro/business_objects/sorqry.rb b/lib/syspro/business_objects/sorqry.rb
index 087e86c..976b409 100644
--- a/lib/syspro/business_objects/sorqry.rb
+++ b/lib/syspro/business_objects/sorqry.rb
@@ -31,11 +31,6 @@ module Syspro
         parser = SorQryParser.new(resp[0].data)
         parser.parse
       end
-
-      def handle_errors(resp)
-        body = resp[0].http_body
-        raise SysproError, body if body =~ /^(ERROR)/
-      end
     end
   end
 end
--
libgit2 0.21.4