You didn't say so - but I have to assume you're wanting some help. Can you provide some more information?
Is this a new machine - or used? I ask because you show that you have a DP-24 (older discontinued model) as opposed to a DP24SD (newer currently-in-production model).
Do you have any experience with the DP-24? Are you familiar with multitrack recording?
Have you upgraded to the newest firmware version for your model?
Are you using an approved SD card?
There are a bunch of helpful, knowledgeable people here - but we'll need a little help in order to help you. Tell us as much as you can.