Cant take off USB CDC task

When I remove the line that creates the USB task from the lwIP project – the next time I compile and run I get a data abort exception.  How can not creating the USB task cause an exception?

Cant take off USB CDC task

Have you removed the idle task hook that writes to the USB port?  If you don’t initialise the USB port but try to write to it, it could well crash. Remove the line vUSBSendByte( cTxByte ); from the function vApplicationIdleHook(); define in file FreeRTOS/Demo/lwIP_Demo_Rowley_ARM7/main.c Regards.