System Workbench for STM32

result = xTaskCreate( thread, ( signed portCHAR * ) name, stacksize, arg, prio, &CreatedTask );

// For each task created, store the task handle (pid) in the timers array.
// This scheme doesn't allow for threads to be deleted
//s_timeoutlists_nextthread++.pid = CreatedTask;

if(result == pdPASS)
{
return CreatedTask;
}

the xTaskCreate is failing with a -1 result. Any one have any ideas?