Comment workflow that cause the error

It should work but further errors could help understand what's going

Commented other necessary part

Add back workflow

Add dependency to knowledge

document_page_approval/__openerp__.py

@@ -43,6 +43,7 @@ Scenario
 * Users reading the page see the last approved version.
     """,
     'depends': [
+        'knowledge',
         'document_page',
         'email_template',
     ],