Anyone know what is changing in usb2serial program for stm32 in ecos

Dear,

        I am using usb stm32 drivers,When I am disable serial init
function,I got error like this,

Entering cyg_user_start() function
Usb2Ser: Thread starting
Error opening USB rx port
Ser2Usb: Thread starting
Error opening USB tx port

STM32 USB : Setting USB device address = 1
STM32 USB : Setting USB configuration = 1
ACM Class Handler
Get Line Coding
ACM Class Handler
*** Unhandled ACM Request: 0x22 ***
STM32 USB : Stall EP0 on UNKNOWN control message : 21 22 00 00 00 00 00 00




        What is change in usbs-serial and usb2serial code and cdl file.What
is meaning of this error.

Thanks,


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