I don't *think* that's the same error message I've gotten, but there's an issue I've seen when building a source distribution and selecting "preserve disk hierarchy". I think that's the setting where the "\Program Files (x86)\National Instruments\..." hierarchy gets replicated underneath the root of your source destination. If your source destination already has several layers of nested folders, it becomes increasingly possible to exceed Windows' string length limit for a path, which I think might be something like 255.
One way around it is to use a CMD or PowerShell window to use the SUBST command to mount a virtual drive letter at the source destination so you can then just reference the drive letter and save a bunch of characters in your path string. For example:
SUBST Z: "C:\Windows\Users\KevinP\Documents\LabVIEW Projects\ProjectName\Source Distribution"
-Kevin P
CAUTION! New LabVIEW adopters -- it's too late for me, but you *can* save yourself. The new subscription policy for LabVIEW puts NI's hand in your wallet for the rest of your working life. Are you sure you're *that* dedicated to LabVIEW? (Summary of my reasons in this post, part of a voluminous thread of mostly complaints starting here).
