I don't understand this on keil

Question

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.

Michael Dietz · Accepted Answer

The files in your nRF51 device family pack are out of date. Simply right click each file and select 'update' or something like that. probably update to version 8.5. After you update it the x will go away and everything will look right.

I don't understand this on keil

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