--- a/tools/interfacedocgen.py
+++ b/tools/interfacedocgen.py
@@ -273,7 +273,8 @@
                 __import__(uri)
                 finst = sys.modules[uri].__dict__[function]
                 workflow = finst()
-            except TypeError:
+            except Exception, e:
+                print ">>> DEBIAN doc building with missing externals >>>: ", e
                 continue
             
             if isinstance(workflow, Workflow):
