ESP8266: Timed out waiting for packet header ERROR

Hi, may I know what is the cause of esp8266 timing out waiting for packet header?
When I start uploding it writes "A fatal esptool.py error occurred: Failed to connect to ESP8266: Timed out waiting for packet header". I am working from Win10 and Arduino IDE 1.8.15.

If someone can solve my problem, I would be very grateful! strong text

as a new user I'd recommend you read this

are you sure you have the correct COM port selected under Tools>Port?
you can check with the Device Manager under Ports (COM and LPT) - as you unplug/plug the ESP8266 USB connector the COM should disappear/appear

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