UndefVarError: Distributions not defined

Hi,
I am very new to Julia but need it for numerical simulations for my master thesis.
I am using the Distributions package, since I have to sample from a von Mises Distribution with parameter \kappa.
Generally sampling from a von Mises distribution works, however in my code I have to do that within a function, since the parameter \kappa depends on other variables defined in the function’s scope.
Unfortunately I cannot get that to work, and I always get an “UndefVarError: Distributions not defined” error.
I assume there is some issue with the scope of variables, however I have no idea how to get the code to work.

Here is the function, where I want to sample from a von Mises distribution (var.n_label[i,j] is a boolean variable, defined in another function above this one):

function set_neighbour_orientation(param,var)
     for i=1:param.N
         tmpx = tmpy = 0.0
         for j=1:param.N 
             tmpx += var.n_label[i,j] * cos(var.θ[j])
             tmpy += var.n_label[i,j] * sin(var.θ[j]) 
         end
         avg_tmpx = tmpx/param.N 
         avg_tmpy = tmpy/param.N #(define the flux)
         J_i =(avg_tmpx, avg_tmpy)
         square = avg_tmpx * avg_tmpx + avg_tmpy * avg_tmpy
         κ = sqrt(square)
         vm = Distributions.VonMises(κ)
         var.ψ[i] = rand(vm)
     end
 end

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