Userimg.jl with enum return WARNING: using Base.e in module Main conflicts with an existing identifier

I have compiled system image building and now when I open the DLL I get warrning.
WARNING: using Base.e in module Main conflicts with an existing identifier
I think it’s something in my userimg.jl.
What can it do?
Thanks.

This causes this piece of code with assignment e=5 in my userimg.jl.
@enum MY_ImportanceType a = 1 b = 2 c = 3 d = 4 e = 5
Why and how to solve such a problem?
I know that e = 2.7182818284590…