错误：MethodError:没有方法匹配Julia中的ccolor（：：Type{ColorTypes.Gray{FixedPointNumbers.Normed{UInt8,8}}}，：：Type{Nothing}）

在Julia中加载贴图时出现以下错误：

ERROR: MethodError: no method matching ccolor(::Type{ColorTypes.Gray{FixedPointNumbers.Normed{UInt8,8}}}, ::Type{Nothing})
Closest candidates are:
  ccolor(::Type{Cdest<:ColorTypes.Colorant}, ::Type{Csrc<:ColorTypes.Colorant}) where {Cdest<:Colorant, Csrc<:Colorant} at /Users/logankilpatrick/.julia/packages/ColorTypes/BsAWO/src/traits.jl:259
  ccolor(::Type{Cdest<:(ColorTypes.Color{T,1} where T)}, ::Type{T<:Number}) where {Cdest<:(Color{T,1} where T), T<:Number} at /Users/logankilpatrick/.julia/packages/ColorTypes/BsAWO/src/traits.jl:260
Stacktrace:
 [1] convert(::Type{ColorTypes.Gray{FixedPointNumbers.Normed{UInt8,8}}}, ::Nothing) at /Users/logankilpatrick/.julia/packages/ColorTypes/BsAWO/src/conversions.jl:7
 [2] ColorTypes.Gray{FixedPointNumbers.Normed{UInt8,8}}(::Nothing) at /Users/logankilpatrick/.julia/packages/ColorTypes/BsAWO/src/types.jl:446
 [3] _broadcast_getindex_evalf at ./broadcast.jl:574 [inlined]
 [4] _broadcast_getindex at ./broadcast.jl:547 [inlined]
 [5] getindex at ./broadcast.jl:507 [inlined]
 [6] copy at ./broadcast.jl:734 [inlined]
 [7] materialize(::Base.Broadcast.Broadcasted{Base.Broadcast.DefaultArrayStyle{0},Nothing,Type{ColorTypes.Gray{FixedPointNumbers.Normed{UInt8,8}}},Tuple{Base.RefValue{Nothing}}}) at ./broadcast.jl:724

---

请注意，它的前两个调用工作正常！我只是把它注释掉，这样我就可以继续处理我遇到的各种错误。我还更改了上面的变量名，使其看起来更通用

你能把这个方法贴在哪里吗？@melanzane是的，我刚刚在上面更新过

holderVar.zone_map  = loadcolormap(map_file_name(sim_params, "Zone"))   
holderVar.depth_map = loadgraymap(map_file_name(sim_params, "Depth"))

#temp_slope_map  = loadgraymap(map_file_name(sim_params, "Slope"))
#holderVar.slope_map = (someFakeNum/someFakeNum) .* (someFakeNum .- temp_slope_map)                       
#temp_elev_map   = loadgraymap(map_file_name(sim_params, "Elevation"))
#holderVar.elev_map  = someFakeNum * someFakeNum .* temp_elev_map