From 18db1904bca83baaa761bf198fd6ec61a8b50a03 Mon Sep 17 00:00:00 2001
From: Richard Frank <rich@quantopian.com>
Date: Wed, 6 Jan 2016 16:02:18 -0500
Subject: [PATCH] BUG: Need to format message, not ValueError instance

---
 zipline/lib/adjusted_array.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/zipline/lib/adjusted_array.py b/zipline/lib/adjusted_array.py
index 7934c0c2..1611300d 100644
--- a/zipline/lib/adjusted_array.py
+++ b/zipline/lib/adjusted_array.py
@@ -82,7 +82,8 @@ def _normalize_array(data):
                 "not representable as datetime64[ns].\n"
                 "Min Date: %s\n"
                 "Max Date: %s\n"
-            ) % (data.min(), data.max())
+                % (data.min(), data.max())
+            )
     else:
         raise TypeError(
             "Don't know how to construct AdjustedArray "