diff --git a/bifacial_radiance/module.py b/bifacial_radiance/module.py
index 18549a64..cbf7757a 100644
--- a/bifacial_radiance/module.py
+++ b/bifacial_radiance/module.py
@@ -272,7 +272,7 @@ def readModule(self, name=None):
             
             return moduleDict
         else:
-            print('Error: module name {} doesnt exist'.format(name))
+            raise Exception('Error: module name "{}" doesnt exist'.format(name))
             return {}
 
 
diff --git a/tests/test_bifacial_radiance.py b/tests/test_bifacial_radiance.py
index cfa6e60f..99fa585f 100644
--- a/tests/test_bifacial_radiance.py
+++ b/tests/test_bifacial_radiance.py
@@ -604,5 +604,19 @@ def test_raypath():
     assert '.' in re.split(':|;', os.environ['RAYPATH'])
     
     os.environ['RAYPATH'] = raypath0    
+
+def test_GH256_nomodule_error():
+    moduletype = 'moduletypeNOTonJason'
+    startdate= '09_23_08'
+    enddate = '09_23_08'
+    demo = bifacial_radiance.RadianceObj('test')
+    metdata = demo.readWeatherFile(MET_FILENAME, starttime=startdate, endtime=enddate)
+    demo.setGround()
+    sceneDict = {'pitch': 7,'hub_height':2, 'nMods':1, 'nRows': 1, 'module_type':moduletype}
+    trackerdict = demo.set1axis(metdata = metdata, cumulativesky = False)
+    foodict = demo.gendaylit1axis()
+    with pytest.raises(Exception):
+        foodict = demo.makeScene1axis(trackerdict=foodict, module=moduletype, 
+                                      sceneDict=sceneDict, cumulativesky=False)
     
     
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