diff --git a/HStringTemplate.cabal b/HStringTemplate.cabal
--- a/HStringTemplate.cabal
+++ b/HStringTemplate.cabal
@@ -1,5 +1,5 @@
 name:                HStringTemplate
-version:             0.5
+version:             0.5.1
 synopsis:            StringTemplate implementation in Haskell.
 description:         A port of the Java library by Terrence Parr.
 category:            Text
diff --git a/Text/StringTemplate/QQ.hs b/Text/StringTemplate/QQ.hs
--- a/Text/StringTemplate/QQ.hs
+++ b/Text/StringTemplate/QQ.hs
@@ -34,7 +34,7 @@
   where
     vars = case parseSTMPNames s of
              Right xs -> xs
-             Left  err -> error "err"
+             Left  err -> error (show err)
     base  = TH.AppE (TH.VarE (TH.mkName "newSTMP")) (TH.LitE (TH.StringL $ s))
     tmpl  = foldr addAttrib base vars
     addAttrib var x = TH.AppE