Peugeot 308 U1218 dtc error

I am getting the U1218 error on my 2012 model 308 vehicle. There is no problem with the vehicle running but it gives a warning. An exclamation mark inside a triangle is lit. I delete it with odb2 and the warning goes away but when I look at it again the same error persists. What is the U1218 error and how can I solve it? Can anyone who has encountered it help me? Thank you in advance.