Failed to launch GDB: .pioinit:13: Error in sourced command file: Remote replied unexpectedly to 'vMustReplyEmpty'

[VitaliyGaliy]

I've got this error.
Everything is setup according to documentation.

main.cpp
#include "Arduino.h"
#include "avr8-stub.h"
#include "app_api.h" // only needed with flash breakpoints

void setup()
{
// initialize GDB stub
debug_init();
pinMode(LED_BUILTIN, OUTPUT);
}

void loop()
{
breakpoint();
digitalWrite(LED_BUILTIN, HIGH);
delay(1000);
digitalWrite(LED_BUILTIN, LOW);
delay(1000);
}