ERROR: BoundsError: attempt to access "fc6"

General Usage
1

when i read the trained parameter of vgg16, there occurs some problem.

julia> function getWeights(file)
           layers=get(file,"layers","")
           meta=get(file,"meta","")
           weights=Dict()
           weights["par"]=16
           for la in layers
               name=SubString(get(la,"name",""),1,4)
               layerth=SubString(get(la,"name",""),5,5)
               lastsyn=SubString(get(la,"name",""),5)
               if name=="conv"
                   weights[string("w",lastsyn)]=la["weights"][1]
                   weights[string("b",lastsyn)]=la["weights"][2]
               elseif name=="fc6"
                   weights["w6"]=la["weights"][1]
                   weights["b6"]=la["weights"][2]
                   return weights
               end
       #        println(la["name"])
           end

       end
getWeights (generic function with 1 method)

julia> weight=getWeights(file);
ERROR: BoundsError: attempt to access "fc6"
  at index [1:4]
Stacktrace:
 [1] checkbounds at ./strings/basic.jl:193 [inlined]
 [2] Type at ./strings/substring.jl:30 [inlined]
 [3] SubString(::String, ::Int64, ::Int64) at ./strings/substring.jl:38
 [4] getWeights(::Dict{String,Any}) at ./REPL[249]:7
 [5] top-level scope at none:0