SlideShow in header

I want to access the SlideShow but I get this error:

'The user checking out does not match the user who checked out the item.
You are not permitted to use that link to directly access that page (#228).'

If this is in backend try following.

Go to Joomla admin > Site > Maintenance > Check-In, Select all items ( click on select all next to database tables text ) and on top right click on check-in.

Now try to edit your module.

See you around...