Unable to connect using 250000 baudrate

[ETS5]

Connecting to port /dev/ttyUSB0, baudrate 250000
Changing monitoring state from "Opening serial connection" to "Error"
Changing monitoring state from "Error" to "Offline after error"
Unexpected error while connecting to serial port /dev/ttyUSB0, baudrate 250000 from hook default: ValueError: 'Failed to set custom baud rate (250000): [Errno 25] Not a tty' @ comm.py:_open_serial:3916
Changing monitoring state from "Offline" to "Opening serial connection"
Connecting to port /dev/ttyUSB0, baudrate 250000
Changing monitoring state from "Opening serial connection" to "Error"
Changing monitoring state from "Error" to "Offline after error"