STM32F723E-DISCO USB HS Slave Mass Storage doesn't work

[lyan.2]

Hello ST,

Here i am using STM32F723E-DISCO demo board developing the USB Slave Mass Storage application, using the CubeMX generating the code for a test, the procedure is below.

1. select STM32F723IEK MCU;
2. select System Core -> RCC -> HSE: BYPASS Clock Source;

3. select connectivity as below:

4. select Middleware as below:

5. config the clock as below:

6. others are keeping the default value;

7. generate the Keil project and build;

8. download to board and connect USB HS cable;

the windows shows a mass storage device in device management list, but it shows errors like below.

what's wrong with this? does there anything wrong?

does there have any demo project about this application.

thanks in advance.

cocobat