Indexing error, You do not have the 'read article collections' permission

We are seeing some indexing errors for articles on a site, is there a way to identify the erroneous article and as this is running via the task server I am unclear why it would not have access?

There was an error indexing content ('Article Collections'). (You do not have the 'read article collections' permission for 'About' that is required to complete this action.)

Will this be stopping other content being indexed? 

The version is 12.1.1.20482