Micro:bit error 030 when trying to send key

[ngammarano]

I have programmed a micro:bit with this project.

I pair the micro:bit, and when I press buttons A or B to send a keyboard message, a sad face appears with error 030 in the LED matrix.
According to micro:bit official website, error 030 is "Corruption detected in the micro:bit heap space (memory allocated usually for the storage of variables). Try flashing a different .hex file to your device".