The content/action module view assumes you have a content_actionhandler.php file in your actions directory. Did you use content/action or did you implement an action view on your own module?
I have write new action for this modules, in the form the action is going to /categories/action, but the the folder name in ext./module/ is actions ... I had tried I get :
The requested view 'actions' could not be found in module: 'categories'
If you have your own action view then you must simply add the view to your module definition. If you want to use the content/action system (not really required) you must create the correct file in the actions subdirectory.