chore: custom error
chore: custom error

rockdragon/julia-programming,rockdragon/julia-programming,rockdragon/julia-programming,rockdragon/julia-programming,rockdragon/julia-programming,rockdragon/julia-programming,rockdragon/julia-programming,rockdragon/julia-programming,rockdragon/julia-programming,rockdragon/julia-programming,rockdragon/julia-programming,rockdragon/julia-programming,rockdragon/julia-programming