Hi, it’s me (again).
I have also a Samsung Galaxy Grand Prime | SM-G530FZ | gprimeltexx so I wanted to make a build for it in order to see if I could do it.
It failed before starting 
Probably something wrong with the roomservice.xml file ?
I used exactly this roomservice.xml file to build for my j5nlte. And just after a successful build, I tried to build for gprimeltexx (with the same roomservice file). The only difference was to answer “gprimeltexx” to the third question instead of “j5nlte”.
So I don’t understand why it fails…
EDIT : OK it’s because there is no “AndroidProducts.mk” file in the device tree source.
I still don’t know what it is and how to solve this but I’m working on it.
EDIT 2 : Oups it was for the Lineage 15.1 branch. For the 16.0 branch there is the AndroidProducts.mk file so now I have no clue.