From 8c7828d4690d79d2487ba60c5bf0197dd29ba675 Mon Sep 17 00:00:00 2001
From: James Cammarata <jimi@sngx.net>
Date: Tue, 25 Mar 2014 11:56:55 -0500
Subject: [PATCH] Tweaking error message resulting from undefined template
 variables

Fixes #5114
---
 lib/ansible/utils/template.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/ansible/utils/template.py b/lib/ansible/utils/template.py
index 0b86954e882..2f79d6ca591 100644
--- a/lib/ansible/utils/template.py
+++ b/lib/ansible/utils/template.py
@@ -338,7 +338,10 @@ def template_from_string(basedir, data, vars, fail_on_undefined=False):
             res = jinja2.utils.concat(rf)
         except TypeError, te:
             if 'StrictUndefined' in str(te):
-                raise errors.AnsibleUndefinedVariable("unable to look up a name or access an attribute in template string")
+                raise errors.AnsibleUndefinedVariable(
+                    "Unable to look up a name or access an attribute in template string. " + \
+                    "Make sure your variable name does not contain invalid characters like '-'."
+                )
             else:
                 raise errors.AnsibleError("an unexpected type error occured. Error was %s" % te)
         return res