Bus error while executing ARMv8 TLB instruction

Hi,

I am facing "Bus error on memory operation" while executing below instruction while invalidating and flushing the TLB.

I am not able to understand what is the reason for "Bus error" as it is a TLB operation instruction ?  Also what Bus error signify ?

Also similar error is coming while I try to invalidate instruction cache.

/* Invalidate and flush the TLB */   

   "tlbi   alle2 \n\t"    \

Thanks,

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