diff --git a/i3pystatus/core/config.py b/i3pystatus/core/config.py
index 105ebc5..ae1aad0 100644
--- a/i3pystatus/core/config.py
+++ b/i3pystatus/core/config.py
@@ -1,5 +1,4 @@
 
-import os
 import os.path
 import runpy
 
@@ -40,4 +39,4 @@ class ConfigFinder:
         if path:
             runpy.run_path(path, run_name="i3pystatus._config")
         else:
-            raise ImportError("Didn't find a config module, tried\n * {mods}".format(mods="\n * ".join(failed)))
+            raise RuntimeError("Didn't find a config file, tried\n * {mods}".format(mods="\n * ".join(failed)))
diff --git a/i3pystatus/parcel.py b/i3pystatus/parcel.py
index db2f9c6..01c4274 100644
--- a/i3pystatus/parcel.py
+++ b/i3pystatus/parcel.py
@@ -6,7 +6,14 @@ from lxml.cssselect import CSSSelector
 
 from i3pystatus import IntervalModule
 
-class DHL:
+class TrackerAPI:
+    def __init__(self, idcode):
+        pass
+
+    def status(self):
+        return {}
+
+class DHL(TrackerAPI):
     URL="http://nolp.dhl.de/nextt-online-public/set_identcodes.do?lang=en&idc={idcode}"
     def __init__(self, idcode):
         self.idcode = idcode
@@ -26,6 +33,8 @@ class DHL:
         return ret
 
 class ParcelTracker(IntervalModule):
+    interval = 20
+
     settings = (
         ("instance", "Tracker instance"),
         "format",