Error compiling for board Dragino Yún + Mega 2560

Hello,

Since today, I've got this message when i try to compil on my IDE 1.8.12:

fatal error: pins_arduino.h: No such file or directory

#include "pins_arduino.h"

^~~~~~~~~~~~~~~~

compilation terminated.

exit status 1
Error compiling for board Dragino Yún + Mega 2560.

I tried to update my IDE to 1.8.12, but the problem is still the same...

Many thanks in advance.

SKETCH ?

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The simplest one !

<
#define BLYNK_PRINT Console
#include <Bridge.h>
#include <Console.h>
#include <BlynkSimpleYun.h>

char auth[] = "xxxxxxx";
void setup()
{
Blynk.begin(auth);
// Console de débogage
Bridge.begin();
Console.begin();
while (!Console);{}
// Vous pouvez également spécifier le serveur:
//Blynk.begin(auth, "blynk-cloud.com", 8442);
//Blynk.begin(auth, IPAddress (192,168,1,100), 8442);
}
void loop()
{
Blynk.run();
// Vous pouvez injecter votre propre code ou le combiner avec d'autres esquisses.
// Consultez d'autres exemples sur la façon de communiquer avec Blynk. N'oubliez pas
// pour éviter la fonction delay ()!
}/>

I'm wondering if the board Mega 2560 works because even without anything in the sketch I have always the same error message : "Error compiling for board Dragino Yún + Mega 2560"...