Its telling you to do a DP (downpipe) and stage 2!
Seriously, just get a DP done. You shouldnt be very worried, but not leave it like that. A blocked DPF will cause a lot of heat build up on the turbo, reducing its life. There will also be somewhat reduced performance and increased fuel consumption.
You can try DPF cleaner additive and go for a long cruise (1h+), but I doubt those things work....