It is quite tricky and annoying to use Distributed.jl in packages. This post could help: Distributed computing for functions in scripts inside a local module? - #5 by dave.f.kleinschmidt and here is a package that does use Distributed: GitHub - beacon-biosignals/OndaBatches.jl: Local and distributed batch loading for Onda datasets. When Distributed creates workers it does not activate the same Julia environment so they don’t have access to the source code; remotecall_eval is one way to activate the environment and load the right code. Instead of includeing code on the workers you should activate the package and load it with using.