I had problems getting it to run at first. Out of desperation, I ultimately decided to retry the whole thing but using the v0.0.03 version of hifisampler instead of v0.0.04
Worked just fine after I did that. It's a little annoying to have to redo everything, but at least it worked in the end. Not sure if you can just add the v.0.0.04 files or not after that to update it, haven't tried and I'm a little afraid of trying because of how much of a pain it was. Hope this helps.
