When I run the compiled the APP, the APP dispalys the "UndefVarError" error, and the variable is in the distributed scope. The following is my code.

```julia

VERSION == v"0.7.0" && __precompile__()

module WEM3D

using Distributed
using Artifacts
using MKL_jll

include("CSEMFileIO/CSEMFileIO.jl")

function julia_main()::Cint

addprocs(12)
@eval @everywhere begin
using WEM3D.CSEMFileIO
end

@eval @everywhere begin

workpath = "/home/em/julia_workshop/WEM3D/WEM3D/test/wemInv0116/"
datafile = workpath * "wemFwdblock0116_pred.dat"
println("Reading data file $(datafile) ...")
#datafile = workpath * datafile
emData = readCSEMData(datafile)

# model file
modfile = workpath * "wemInvblock0116.model"
println("Reading model file $(modfile) ...")
sigBody = 0.1
sigAir = 1e-8
sigWater = 3.3
@time emMesh = readCSEMModel(modfile; sigAir = sigAir, sigWater = sigWater)

end

#
println("Calculating primary field ...")
cputime01 = @elapsed epField = parPrimaryElectricField(emMesh)

return 0

end

end
```
When run this, the running info is:
```shell
From worker 10: Reading data file /home/em/julia_workshop/WEM3D/WEM3D/test/wemInv0116/wemFwdblock0116_pred.dat ...
From worker 10: Reading model file /home/em/julia_workshop/WEM3D/WEM3D/test/wemInv0116/wemInvblock0116.model ...
From worker 9: Reading data file /home/em/julia_workshop/WEM3D/WEM3D/test/wemInv0116/wemFwdblock0116_pred.dat ...
From worker 9: Reading model file /home/em/julia_workshop/WEM3D/WEM3D/test/wemInv0116/wemInvblock0116.model ...
From worker 11: Reading data file /home/em/julia_workshop/WEM3D/WEM3D/test/wemInv0116/wemFwdblock0116_pred.dat ...
From worker 11: Reading model file /home/em/julia_workshop/WEM3D/WEM3D/test/wemInv0116/wemInvblock0116.model ...
From worker 12: Reading data file /home/em/julia_workshop/WEM3D/WEM3D/test/wemInv0116/wemFwdblock0116_pred.dat ...
From worker 12: Reading model file /home/em/julia_workshop/WEM3D/WEM3D/test/wemInv0116/wemInvblock0116.model ...
From worker 13: Reading data file /home/em/julia_workshop/WEM3D/WEM3D/test/wemInv0116/wemFwdblock0116_pred.dat ...
1.809170 seconds (2.50 M allocations: 732.809 MiB, 19.01% gc time, 63.54% compilation time)
Calculating primary field ...
UndefVarError: emMesh not defined
```
But when I run the original julia code, it works well in my workstation. Can you help me to solve the variable scope problem?

Start with the compiled application's julia_main function and its @everywhere blocks, then inspect how emMesh is created before parPrimaryElectricField(emMesh) runs. Reproduce the compiled application and determine whether the distributed-scope setup leaves emMesh unavailable; done means the reported UndefVarError no longer occurs.

Written by the indexing model from the issue text.