Index: /issm/trunk-jpl/src/m/classes/taoinversion.m
===================================================================
--- /issm/trunk-jpl/src/m/classes/taoinversion.m	(revision 16427)
+++ /issm/trunk-jpl/src/m/classes/taoinversion.m	(revision 16428)
@@ -67,4 +67,8 @@
 			%Early return
 			if ~obj.iscontrol, return; end
+
+			if ~IssmConfig('_HAVE_TAO_'),
+				md = checkmessage(md,['TAO has not been installed, ISSM needs to be reconfigured and recompiled with TAO']);
+			end
 
 			num_controls=numel(md.inversion.control_parameters);