diff --git a/libpathod/__init__.py b/libpathod/__init__.py
index e841a6ab6..4ef52a84c 100644
--- a/libpathod/__init__.py
+++ b/libpathod/__init__.py
@@ -16,7 +16,6 @@ def application(**settings):
                     (r"/preview", handlers.Preview),
                     (r"/p/.*", handlers.Pathod, settings),
                 ],
-                debug=True,
                 static_path = utils.data.path("static"),
                 template_path = utils.data.path("templates"),
            )
diff --git a/libpathod/handlers.py b/libpathod/handlers.py
index a697304cd..ebf85b03f 100644
--- a/libpathod/handlers.py
+++ b/libpathod/handlers.py
@@ -36,9 +36,9 @@ class Pathod(object):
         try:
             self.response = rparse.parse(self.settings, spec)
         except rparse.ParseException, v:
-            self.response = rparse.StubResponse(
+            self.response = rparse.InternalResponse(
                 800,
-                "Error parsing response spec:" + str(v)
+                "Error parsing response spec: %s\n"%v.msg + v.marked()
             )
 
     def _execute(self, transforms, *args, **kwargs):
diff --git a/libpathod/rparse.py b/libpathod/rparse.py
index d1714fb8c..5c6d02570 100644
--- a/libpathod/rparse.py
+++ b/libpathod/rparse.py
@@ -5,7 +5,17 @@ import tornado.ioloop
 
 TESTING = False
 
-class ParseException(Exception): pass
+class ParseException(Exception):
+    def __init__(self, msg, s, col):
+        Exception.__init__(self)
+        self.msg = msg
+        self.s = s
+        self.col = col
+
+    def marked(self):
+        return "%s\n%s"%(self.s, " "*(self.col-1) + "^")
+
+
 class ServerError(Exception): pass
 
 
@@ -304,19 +314,9 @@ class Response:
     code = 200
     msg = LiteralGenerator(http.RESPONSES[code])
     body = LiteralGenerator("OK")
-    def __init__(self, settings, tokens):
-        self.tokens = tokens
+    def __init__(self):
         self.headers = []
         self.pauses = []
-        for i in tokens:
-            i.mod_response(settings, self)
-        if self.body and not self.get_header("Content-Length"):
-            self.headers.append(
-                (
-                    LiteralGenerator("Content-Length"),
-                    LiteralGenerator(str(len(self.body))),
-                )
-            )
 
     def get_header(self, hdr):
         for k, v in self.headers:
@@ -393,6 +393,14 @@ class Response:
         fp.finish()
 
     def render(self, fp):
+        if self.body and not self.get_header("Content-Length"):
+            self.headers.append(
+                (
+                    LiteralGenerator("Content-Length"),
+                    LiteralGenerator(str(len(self.body))),
+                )
+            )
+
         hdrs = []
         for k, v in self.headers:
             hdrs.extend([
@@ -423,8 +431,17 @@ class Response:
         return "\n".join(parts)
 
 
-class StubResponse:
+class CraftedResponse(Response):
+    def __init__(self, settings, tokens):
+        Response.__init__(self)
+        self.tokens = tokens
+        for i in tokens:
+            i.mod_response(settings, self)
+
+
+class InternalResponse(Response):
     def __init__(self, code, body):
+        Response.__init__(self)
         self.code = code
         self.msg = LiteralGenerator(http.RESPONSES.get(code, "Unknown error"))
         self.body = LiteralGenerator(body)
@@ -442,6 +459,6 @@ class StubResponse:
 
 def parse(settings, s):
     try:
-        return Response(settings, Response.expr().parseString(s, parseAll=True))
+        return CraftedResponse(settings, Response.expr().parseString(s, parseAll=True))
     except pp.ParseException, v:
-        raise ParseException(v)
+        raise ParseException(v.msg, v.line, v.col)
diff --git a/test/test_rparse.py b/test/test_rparse.py
index 0ee3aae46..8e9da6f05 100644
--- a/test/test_rparse.py
+++ b/test/test_rparse.py
@@ -4,6 +4,17 @@ from libpathod import rparse
 
 rparse.TESTING = True
 
+class DummyRequest(StringIO.StringIO):
+    def write(self, d, callback=None):
+        StringIO.StringIO.write(self, d)
+        if callback:
+            callback()
+
+    def finish(self):
+        return
+
+
+
 class uMisc(libpry.AutoTree):
     def test_generators(self):
         v = rparse.Value.parseString("val")[0]
@@ -130,8 +141,10 @@ class uMisc(libpry.AutoTree):
         r = e.parseString('10')[0]
         assert r.msg.val == "Unknown code"
 
-    def test_stub_response(self):
-        s = rparse.StubResponse(400, "foo")
+    def test_internal_response(self):
+        d = DummyRequest()
+        s = rparse.InternalResponse(400, "foo")
+        s.render(d)
 
 
 class uDisconnects(libpry.AutoTree):
@@ -175,6 +188,10 @@ class uPauses(libpry.AutoTree):
 class uparse(libpry.AutoTree):
     def test_parse_err(self):
         libpry.raises(rparse.ParseException, rparse.parse, {}, "400:msg,b:")
+        try:
+            rparse.parse({}, "400:msg,b:")
+        except rparse.ParseException, v:
+            print v.marked()
 
     def test_parse_header(self):
         r = rparse.parse({}, "400,h:foo:bar")
@@ -193,16 +210,6 @@ class uparse(libpry.AutoTree):
         assert ("random", 10) in r.pauses
 
 
-class DummyRequest(StringIO.StringIO):
-    def write(self, d, callback=None):
-        StringIO.StringIO.write(self, d)
-        if callback:
-            callback()
-
-    def finish(self):
-        return
-
-
 class uResponse(libpry.AutoTree):
     def dummy_response(self):
         return rparse.parse({}, "400:msg")
diff --git a/todo b/todo
index 5ad3c4b89..14b2a9dcd 100644
--- a/todo
+++ b/todo
@@ -1,6 +1,6 @@
 
-- Files
 - Shortcuts
 - HTTPS
-- Sequences
 - Anchors
+- Sequences
+