diff --git a/overviewer_core/util.py b/overviewer_core/util.py
index 826dcd9..a11cb26 100644
--- a/overviewer_core/util.py
+++ b/overviewer_core/util.py
@@ -62,7 +62,7 @@ def findGitHash():
 
 def findGitVersion():
     try:
-        p = Popen(['git', 'describe', '--tags'], stdout=PIPE, stderr=PIPE, shell=True)
+        p = Popen('git describe --tags', stdout=PIPE, stderr=PIPE, shell=True)
         p.stderr.close()
         line = p.stdout.readlines()[0]
         if line.startswith('release-'):
diff --git a/overviewer_core/world.py b/overviewer_core/world.py
index 3bb34ec..1f8238e 100644
--- a/overviewer_core/world.py
+++ b/overviewer_core/world.py
@@ -79,7 +79,10 @@ class World(object):
         # if not mcregion, error out early
         data = nbt.load(os.path.join(self.worlddir, "level.dat"))[1]['Data']
         if not ('version' in data and data['version'] == 19132):
-            logging.error("Sorry, This version of Minecraft-Overviewer only works with the old McRegion format. You will need to upgrade to render Minecraft 1.2 ('Anvil') worlds")
+            logging.error("Sorry, This version of Minecraft-Overviewer only works with McRegion format")
+            if ('version' in data and data['version'] == 19133):
+                logging.error("You will need to upgrade to render Minecraft 1.2 ('Anvil') worlds")
+                logging.error("Please see http://overviewer.org/blog/2012/03/01/anvil-support/")
             sys.exit(1)
         if 'LevelName' in data:
             # level.dat should have the LevelName attribute so we'll use that