Sometime compiling correctly and without any changes error compiling

[rcoppens]

Hello,
I don't understand, I wrote a code for M5Stack (Grey) to connect a website. This code is small and sometime Arduino GUI compiling correctly and a few minutes after without any kind of changes, it doesn't compiling again. I received this message: "Error compiling for board M5Stack-Core-ESP32".
All library are up to date.

Thanks for your help in advance.

Remy