ValueError: incompatible .mpy file

[alpha71]

Hello,
running a simple program with remote control under Pybrick Beta i got a msg error _ValueError: incompatible .mpy file_!
The code is simple:

from pybricks.hubs import MoveHub
from pybricks.parameters import Button, Port, Direction, Stop, Color
from pybricks.pupdevices import Remote, Motor
from pybricks.tools import wait

# Initialize the hub.
hub = MoveHub()

# Connect to the remote.
remote = Remote()

# Initialize the motors
steer = Motor(Port.D)

frontA = Motor(Port.A, Direction.COUNTERCLOCKWISE)
frontB = Motor(Port.B, Direction.CLOCKWISE)

frontA.control.limits(acceleration=3000)
frontB.control.limits(acceleration=3000)

# Initialize the calibration
hub.light.on(Color.RED)
wait(500)

left_end = steer.run_until_stalled(-200, duty_limit=30, then=Stop.BRAKE)
right_end = steer.run_until_stalled(200, duty_limit=30, then=Stop.BRAKE)

steer.reset_angle((right_end - left_end) // 2)
steer.run_target(speed=300, target_angle=0, wait=False)
frontA.reset_angle(0)
frontB.reset_angle(0)

angle = 90
trim = 0

while True:

    pressed = remote.buttons.pressed()
    steer_angle = trim
    if Button.LEFT_PLUS in pressed:
        steer_angle -= angle
    if Button.LEFT_MINUS in pressed:
        steer_angle += angle

    steer.run_target(500, steer_angle, wait=False)

    drive_speed = 0 
    if Button.RIGHT_PLUS in pressed:
        drive_speed += 1000
    if Button.RIGHT_MINUS in pressed:
        drive_speed -= 1000


    frontA.run(drive_speed)
    frontB.run(drive_speed)
    print(duty)
    wait(10)

So i don't know actually the reason why get this error (actually if i restart the Hub it works once then give the error of incompatobility!). Do you have any suggestion?

[dlech]

This can happen if you accidentally type in the terminal when no program is running. See #303.