What does RT_ERROR_INVALID_VALUE mean

I get above return code when trying to
rtBufferGetDevicePointer(
bufs.vertices->get(),
OCD->oOptixDev,
&OCD->pVtx )
So whose VALUE it is referring to?? I did go through the manual there is no more information on the enumeration.
Some help is much appreciated.

Hi, I think it would be better to ask this question on our OptiX board.