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FreeRTOS crashing

Question asked by lee.tom.002 on Nov 10, 2015
Free RTOS is crashing when it is trying to increment Tick. (function xTaskIncrementTick)
I get a  data bus error hard fault caused by  the 'if' statement shown below. obviously if I turn Preemption off, it then works.
application is built using cubeMx and is using VCP, and FATfs.
anyone have go any idea of what is going wrong? a simple application with only freeRTOS works fine.

          
/* Tasks of equal priority to the currently running task will share
processing time (time slice) if preemption is on, and the application
writer has not explicitly turned time slicing off. */
#if ( ( configUSE_PREEMPTION == 1 ) && ( configUSE_TIME_SLICING == 1 ) )
{
    if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ pxCurrentTCB->uxPriority ] ) ) > ( unsigned portBASE_TYPE ) 1 )
    {
        xSwitchRequired = pdTRUE;
    }
}
#endif /* ( ( configUSE_PREEMPTION == 1 ) && ( configUSE_TIME_SLICING == 1 ) ) */

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