Is the Game present in the Task Manager? If it is, there might be a bug that persisted in newer versions of the tool (since version R5.02 had a typo in the cache settings and it was fixed in version R5.03 Update 1). If possible, reset the default settings and attempt to build a version of the game.
For recipe files, it's an easy fix: Open the Project Settings -> "Compiler and Packer" -> Halva Settings -> Relative cache location. Remove the first / character (it should something like path/to/location, not /path/to/location).
This could also happen if you are using version 0.29.4 of NW.js. That version doesn't seem to work properly with Halva.