Sigma fail indicates that the standard deviation of all the photon travel times is wider than what you have set up. This can be from a very complex scene or it can be that your setting of the sigma limit is just too small. You can INCREASE Sigma limit and the warning will go away.
The Min Range Fail says there are too few photons to get a good answer. You can DECREASE the number of photons you demand to receive and this warning will disappear as well.
Probably should not ignore them completely. They do provide information. You just need to find a limit you are happy with.
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