diff --git a/IPython/nbconvert/writers/files.py b/IPython/nbconvert/writers/files.py
index a732bd0..51d8e9c 100644
--- a/IPython/nbconvert/writers/files.py
+++ b/IPython/nbconvert/writers/files.py
@@ -63,7 +63,7 @@ class FilesWriter(WriterBase):
 
             # Verify that a notebook name is provided.
             if notebook_name is None:
-                raise AttributeError('notebook_name')
+                raise TypeError('notebook_name')
 
             # Pull the extension and subdir from the resources dict.
             output_extension = resources.get('output_extension', None)