Failed to connect to ESP32

I tried to upload code for the second time on same port, but always got error.

A fatal error occurred: Failed to connect to ESP32: No serial data received.
For troubleshooting steps visit: Troubleshooting - ESP32 - — esptool.py latest documentation
the selected serial port For troubleshooting steps visit: Troubleshooting - ESP32 - — esptool.py latest documentation
does not exist or your board is not connected

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