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HardFault when I use os_evt_wait_or

With STM32 (Cortex M3)...

when I execute this, the RTX jumps to HardFault_Handler in STM32F10x.s

if(os_evt_wait_or(flag1 | flag2 | flag3 | flag4, 15) == OS_R_EVT)
{ bla bla bla
}

I don't know what to do.

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