Index: trunk/SDToolBox/output_messages.py
===================================================================
diff -u -r58 -r59
--- trunk/SDToolBox/output_messages.py	(.../output_messages.py)	(revision 58)
+++ trunk/SDToolBox/output_messages.py	(.../output_messages.py)	(revision 59)
@@ -20,3 +20,4 @@
 error_no_dataset_in_output_data = 'No valid dataset in OutputData.'
 error_all_arguments_required = 'All arguments are required for resampling.'
 error_max_lon_not_set = 'Max longitud needs to be set.'
+error_needs_to_be_in_subclass = 'Needs to be implemented in subclasses.'