In order to help you as much as possible, it always helps us to get as much information as we can from you.
Such as: How long have you been noticing the error? Did you download a new app or apps prior to the error occuring? Has it occured since the minute you set up the phone? Does it happen randomly, or only when you perform a specific sequence of actions (i.e. opening one particular app)? Is your phone rooted or stock? Are you running TW or a different launcher?
Just tossing up the error message isn't always going to work.
Having said all that...just from the small tidbit you gave us, I am suspecting a third party app is trying to do a wakelock in order to run and it isn't working with your Note 4.