In some cases the driver was installed "twice" and SteamVR gets confused and crashes. If it happens to you, just run NaLo once before SteamVR and it will fix the problem.
Fixed error 301
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Source: Steam Community (opens in a new tab)
In some cases the driver was installed "twice" and SteamVR gets confused and crashes. If it happens to you, just run NaLo once before SteamVR and it will fix the problem.