ResNet Code does not working

Hi, 

I am trying to run the ResNet example  (https://github.com/boathit/Benchmark-Flux-PyTorch/blob/master/flux-resnet.jl ). 

But I am getting an error " LoadError: MethodError: no method matching ∇meanpool(::Array{Float32,4}, ::Array{Float64,4}, ::Array{Float64,4}, ::PoolDims{2,(8, 8),(8, 8),(0, 0, 0, 0),(1, 1)})". How can I solve it?

Thanks
Siddik