Index: trunk/SDToolBox/output_messages.py
===================================================================
diff -u -r65 -r73
--- trunk/SDToolBox/output_messages.py	(.../output_messages.py)	(revision 65)
+++ trunk/SDToolBox/output_messages.py	(.../output_messages.py)	(revision 73)
@@ -26,3 +26,4 @@
 error_no_gradient_was_calculated = 'No gradient was calculated, ' + \
                                     ' please calculate the gradient on the xarray before proceeding'
 error_function_not_implemented = 'Functionality not implemented.'
+error_only_for_gridded_dataset = 'Functionality only available for gridded datasets.'
\ No newline at end of file