Evaluation into the closed module `__anon__` breaks incremental compilation because the side effects will not be permanent

General Usage
1

I try to compile my project:

julia --project=@. --startup-file=no --trace-compile=sysimage/precompile.jl test/runtests.jl

This compilation gives me the following error:

LoadError: Evaluation into the closed module `__anon__` breaks incremental compilation because the side effects will not be permanent. This is likely due to some other module mutating `__anon__` with `eval` during precompilation - don't do this.
Stacktrace:
  [1] eval
    @ .\boot.jl:360 [inlined]
  [2] _pywrap(o::PyCall.PyObject, mname::Symbol)
    @ PyCall c:\users\user1\.julia\packages\PyCall\3fwVL\src\PyCall.jl:393
  [3] _pywrap_pyimport
    @ c:\users\user1\.julia\packages\PyCall\3fwVL\src\PyCall.jl:414 [inlined]
  [4] _pywrap_pyimport(o::PyCall.PyObject)
    @ PyCall c:\users\user1\.julia\packages\PyCall\3fwVL\src\PyCall.jl:413
  [5] top-level scope
    @ c:\users\user1\.julia\packages\PyCall\3fwVL\src\PyCall.jl:594
  [6] include
    @ .\Base.jl:386 [inlined]
  [7] include_package_for_output(pkg::Base.PkgId, input::String, depot_path::Vector{String}, dl_load_path::Vector{String}, load_path::Vector{String}, concrete_deps::Vector{Pair{Base.PkgId, UInt64}}, source::String)
    @ Base .\loading.jl:1235
  [8] top-level scope
    @ none:1
  [9] eval
    @ .\boot.jl:360 [inlined]
 [10] eval(x::Expr)
    @ Base.MainInclude .\client.jl:446
 [11] top-level scope
    @ none:1
in expression starting at c:\users\user1\test_project\src\test_project.jl:1
```als
I use PyCall and import one Python function in my project. How to solve this problem?
2

Welcome! It’s impossible to help debug this without knowing what code you have in your module, what you’re trying to achieve and what you’ve tried so far. Please consider posting a minimally contained example, as described here: