Yeah, this isn’t related to the Laplacians package at all — and almost certainly isn’t going to pose any problems for you. If you’d like to help us nail down where it’s going wrong, though, you could post the output of the following:
julia> import Random: RandomDevice
julia> rand(RandomDevice(), UInt32, 4)
4-element Array{UInt32,1}:
0x03b66465
0x59b9037e
0x7fe5ee09
0x0a5d16e0
I’m guessing it may error on your machine.