Warning: type does not exist in workspace; reconstructing

I was using the below code to create .jld2 file containing an instance Sim of structure Simulation

include("./SimulationStructure.jl");
function appFunction()
Sim = Simulation();
io = open("$(@__DIR__)/generatedElements.jld2", "w")
close(io)
save("$(@__DIR__)/generatedElements.jld2", "Sim", Sim)
end
appFunction();

in which SimulationStructure.jl:

using base
export Simulation 
Base.@kwdef mutable struct Simulation 
    dt::Float64 = 1e-6
    tmax::Float64 = 32*1e-3
end

Then, I was reading the created .jld2 by the below code called readFile.jl. and It was working without any warning, in which typeof Sim is Simulation

include("./SimulationStructure.jl");
Sim = load("$(@__DIR__)/generatedElements.jld2", "Sim");
julia> typeof(Sim)
Simulation

Now, I have built executable for appFunction() as below and it works fine to generate the .jld2 file.

module readApp

Base.@ccallable function julia_main()::Cint
    try
        appFunction()
    catch
        Base.invokelatest(Base.display_error, Base.catch_stack())
        return 1
    end
    return 0
end

Base.@kwdef mutable struct Simulation 
  dt::Float64 = 1e-6
  tmax::Float64 = 32*1e-3
end

function appFunction()
Sim = Simulation();
io = open("$(@__DIR__)/generatedElements.jld2", "w")
close(io)
save("$(@__DIR__)/generatedElements.jld2", "Sim", Sim)
end
end

However, calling readFile.jl to read the generated .jld2 gives this warning and typeof Sim is Simulation

┌ Warning: type readApp.Simulation does not exist in workspace; reconstructing
└ @ JLD2 C:\Users\amroa\.julia\packages\JLD2\k9Gt0\src\data\reconstructing_datatypes.jl:461
julia> typeof(Sim)
JLD2.ReconstructedTypes.var"##readApp.Simulation#292"

How can I get ride of the warning and fix the typeof(Sim) to be of Simulation?

Answer is at:

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