I don't understand this on keil

[Yacire]

Hi,

I have this following picture on keil when i am doing the first TUTORIAL (in tutorial party), the example works but i don't understand why keil display this (red cross):

Thanks for you answer, Yacire.

[awneil]

I didn't say he's not allowed to ask here - just that it is nothing to do with Nordic. It is covered in the Keil documentation.