Saving workflow as template and importing to another site collection is not working

Question

I've created primitive reusable workflow (with the only action log to history list) using SPD 2010. Under option Pick a base content type to limit this workflow to I leave All content types.
After creating I pressed Save As Template SPD ribbon button to save my workflow as .wsp in site assets library. Next I downloaded this wsp and deploy it to my farm. Next I went to another site collection and activate workflow feature - name sounds something like Workflow template <name> from web template <name>. All ok at this stage.

But when I was trying to associate this workflow to a custom list, in the list of available workflows my template is not presented. But feature activated successfully, I can open this site in SPD and see my workflow under Workflows option.

But why I can't see my imported workflow in the Add Workflow page of a list? I was trying to associate workflow with list through SPD, but got Null reference exception

Answer 1

maybe the feature is not activated in the site level and only activated in the site collection level

Answer 2

Try a common base content type like Document and re-deploy the wsp to see if this works on a Document Library and if this removes the Null Reference Exception