"1. Expected CMD Letter" Error with USB Connection

[3DStyle]

Hello,

I'm trying to connect my PC to the GRBL32 bit board but with no success.

I use bCNC and do as follows:

To connect your computer to the machine, you have to connect USB cable to the USB port of the TFT ESP32, on the computer, choose baud rate 115200 and the good COM port, click connect, then once the connection established, on TFT, go to Print> USB. There the TFT becomes “transparent” and connection is established between computer and GRBL which is on the STM32.

When I try to connect, I see a message on the TFT screen that says:
"1. Expected CMD Letter" error.

What is going on? With manual control I can move all axis normally.