Error in last cell

[SubhankarGhosh]

While running the last cell I'm getting this error:

MethodError: Cannot convert an object of type AutoGrad.Rec{Array{Float64,4}} to an object of type Array
This may have arisen from a call to the constructor Array(...),
since type constructors fall back to convert methods.

Stacktrace:
[1] tv_loss(::AutoGrad.Rec{Array{Float64,4}}, ::Float64) at ./In[10]:12
[2] loss(::AutoGrad.Rec{Array{Float64,4}}, ::Float64, ::Int64, ::Array{Float64,4}, ::NTuple{5,Int64}, ::Array{Any,1}, ::Array{Float64,1}, ::Float64) at ./In[11]:6
[3] forward_pass(::Function, ::Tuple{Array{Float64,4},Float64,Int64,Array{Float64,4},NTuple{5,Int64},Array{Any,1},Array{Float64,1},Float64}, ::Array{Any,1}, ::Int64) at /home/subhankar/.julia/v0.6/AutoGrad/src/core.jl:88
[4] (::AutoGrad.##gradfun#4#6{#loss,Int64})(::Array{Any,1}, ::Function, ::Array{Float64,4}, ::Vararg{Any,N} where N) at /home/subhankar/.julia/v0.6/AutoGrad/src/core.jl:57
[5] (::AutoGrad.#gradfun#5)(::Array{Float64,4}, ::Vararg{Any,N} where N) at /home/subhankar/.julia/v0.6/AutoGrad/src/core.jl:57
[6] style_transfer(::String, ::String, ::Int64, ::Int64, ::Int64, ::Float64, ::NTuple{5,Int64}, ::Array{Float64,1}, ::Float64, ::Bool) at ./In[12]:60
[7] style_transfer(::String, ::String, ::Int64, ::Int64, ::Int64, ::Float64, ::NTuple{5,Int64}, ::Array{Float64,1}, ::Float64) at ./In[12]:25
[8] include_string(::String, ::String) at ./loading.jl:522
[9] execute_request(::ZMQ.Socket, ::IJulia.Msg) at /home/subhankar/.julia/v0.6/IJulia/src/execute_request.jl:193
[10] (::Compat.#inner#6{Array{Any,1},IJulia.#execute_request,Tuple{ZMQ.Socket,IJulia.Msg}})() at /home/subhankar/.julia/v0.6/Compat/src/Compat.jl:189
[11] eventloop(::ZMQ.Socket) at /home/subhankar/.julia/v0.6/IJulia/src/eventloop.jl:8
[12] (::IJulia.##13#16)() at ./task.jl:335

I'm on Julia 0.6.4 running on Elementary OS 5