diff --git a/sams_classes/sams_app.py b/sams_classes/sams_app.py
index 78e23c3fa89d56e3d71a382b3eca5f7ca6c0990e..f8dcb23ca8826998404cf305e9da6091723723db 100644
--- a/sams_classes/sams_app.py
+++ b/sams_classes/sams_app.py
@@ -66,7 +66,7 @@ class SAMSApp:
       pass
     attrList = attrString.split('.')
     if len(attrList) <= 1:
-      raise FunctionNotExists('The function ' + attrString + ' does not exist')
+      raise FunctionNotExists(('The function ' + attrString + ' does not exist'))
     return SAMSApp._get_attr(getattr(thing, attrList[0]), '.'.join(attrList[1:]))
   
   @property