Index: /issm/trunk-jpl/src/m/mesh/planet/gmsh/gmshplanet.py
===================================================================
--- /issm/trunk-jpl/src/m/mesh/planet/gmsh/gmshplanet.py	(revision 25095)
+++ /issm/trunk-jpl/src/m/mesh/planet/gmsh/gmshplanet.py	(revision 25096)
@@ -33,5 +33,5 @@
     gmshmajorversion = outs
     if gmshmajorversion not in [3, 4]:
-        raise RuntimeError('gmshplanet: Gmsh major version %s not supported!' % gmshmajorversion)
+        raise RuntimeError("gmshplanet: Gmsh major version {} not supported!".format( gmshmajorversion))
 
     #process options