Index: /issm/trunk-jpl/src/m/solve/marshall.py
===================================================================
--- /issm/trunk-jpl/src/m/solve/marshall.py	(revision 20911)
+++ /issm/trunk-jpl/src/m/solve/marshall.py	(revision 20912)
@@ -37,5 +37,5 @@
 		#Marshall current object
 		#print "marshalling %s ..." % field
-		exec("md.%s.marshall('md.%s',md,fid)" %(field,field))
+		exec("md.{}.marshall('md.{}',md,fid)".format(field,field))
 
 	#Last, write "md.EOF" to make sure that the binary file is not corrupt