# Trouble Using Cthulhu in VsCode Integrated Terminal

**URL:** <https://discourse.julialang.org/t/trouble-using-cthulhu-in-vscode-integrated-terminal/97822>\
**Category:** Tooling\
**Tags:** performance, vscode\
**Created:** [April 23, 2023, 4:54pm UTC](https://discourse.julialang.org/t/trouble-using-cthulhu-in-vscode-integrated-terminal/97822 "2023-04-23T16:54:56Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![TI36XPro](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ti36xpro/32/33658_2.png) [@TI36XPro](https://discourse.julialang.org/u/TI36XPro)\
**Post date:** [April 23, 2023, 4:54pm UTC](https://discourse.julialang.org/t/trouble-using-cthulhu-in-vscode-integrated-terminal/97822/1 "2023-04-23T16:54:56Z")

</div>

Hello,

I am trying to following along with [this](https://www.youtube.com/watch?v=Fq2BffZOabE) video here on performance in Julia. I’ve created a fresh environment with Cthulhu version 2.8.13. I did not add any other packages. I open vscode in my package directory and then set that as the Julia environment for Vscode to use.

I then start a Julia REPL by pressing shift and enter on the first line (see below).

```julia
using Cthulhu

add2(a, b) = a + b

```

Then I try to do `@descend add2(1, 2)` in the REPL that has opened in the integrated terminal but I get the following error. This does **not** occur when I go thru this process in a standalone REPL outside VsCode. This error does not make sense to me because I am not passing `Nothing` so I am not sure how it is getting that.

```julia
julia> @descend add2(1, 2)
ERROR: MethodError: no method matching +(::Nothing, ::Int64)
Closest candidates are:
  +(::Any, ::Any, ::Any, ::Any...) at operators.jl:591
  +(::T, ::T) where T<:Union{Int128, Int16, Int32, Int64, Int8, UInt128, UInt16, UInt32, UInt64, UInt8} at int.jl:87
  +(::T, ::Integer) where T<:AbstractChar at char.jl:237
  ...

```

I’m assuming I am screwing something up with environments here? My Julia extension is version 1.38.2.