Index: /issm/trunk-jpl/src/m/classes/clusters/cloud.m
===================================================================
--- /issm/trunk-jpl/src/m/classes/clusters/cloud.m	(revision 15377)
+++ /issm/trunk-jpl/src/m/classes/clusters/cloud.m	(revision 15378)
@@ -72,4 +72,7 @@
 			system(compressstring);
 
+			if isempty(cluster.login),
+				error('cloud BuildQueueScript: login should be supplied!');
+			end
 			disp('uploading input file and queueing script');
 			issmstscpout(cluster.name,cluster.executionpath,cluster.login,{[dirname '.tar.gz']});