1 files changed, 12 insertions, 0 deletions
diff --git a/src/nbblib/plugins.py b/src/nbblib/plugins.py
index bd6839b..1b7a653 100644
--- a/src/nbblib/plugins.py
+++ b/src/nbblib/plugins.py
@@ -1,3 +1,6 @@
+import sys
+
+
 class DuplicatePluginName(Exception):
     pass
 
@@ -35,6 +38,15 @@ class PluginDict(object):
 # Slightly modified go store plugins as dict.
 ########################################################################
 
+
+class NoPluginsRegistered(Exception):
+    def __init__(self, cls):
+        super(NoPluginsRegistered, self).__init__()
+        self.cls = cls
+    def __str__(self):
+        return "No %s plugins registered" % (self.cls.__name__)
+    
+
 class GenericPluginMeta(type):
     def __init__(cls, name, bases, attrs):
         if not hasattr(cls, 'plugins'):