# ERROR: cannot document the following expression: using PATHSolver
**URL:** https://discourse.julialang.org/t/error-cannot-document-the-following-expression-using-pathsolver/87496
**Category:** Optimization (Mathematical)
**Tags:** question
**Created:** [September 19, 2022, 10:22pm UTC](https://discourse.julialang.org/t/error-cannot-document-the-following-expression-using-pathsolver/87496 "2022-09-19T22:22:24Z")
**Posts on this page:** 11
**Page:** 1
### Author:  [@Muhammad\_Nadeem](https://discourse.julialang.org/u/Muhammad_Nadeem)
#### Post date: [September 19, 2022, 10:22pm UTC](https://discourse.julialang.org/t/error-cannot-document-the-following-expression-using-pathsolver/87496/1 "2022-09-19T22:22:24Z")
Hello all,
I am new to Julia, I am trying to run a simple optimization problem using PathSolver. I have installed the PathSolver, but it is giving me this error
ERROR: cannot document the following expression:
using PATHSolver
Any thoughts whats is going on? Any help will be much appreciated. Thanks
Attached is the screenshot of my code
---
### Author:  [@odow](https://discourse.julialang.org/u/odow)
#### Post date: [September 19, 2022, 10:28pm UTC](https://discourse.julialang.org/t/error-cannot-document-the-following-expression-using-pathsolver/87496/2 "2022-09-19T22:28:52Z")
How are you running the file?
“cannot document the following expression” sounds like you’re trying to look up the documentation for it?
---
### Author:  [@Muhammad\_Nadeem](https://discourse.julialang.org/u/Muhammad_Nadeem)
#### Post date: [September 19, 2022, 10:30pm UTC](https://discourse.julialang.org/t/error-cannot-document-the-following-expression-using-pathsolver/87496/3 "2022-09-19T22:30:03Z")
I am just running the code using Visual Studio Code software with Julia as language.
---
### Author:  [@odow](https://discourse.julialang.org/u/odow)
#### Post date: [September 19, 2022, 10:31pm UTC](https://discourse.julialang.org/t/error-cannot-document-the-following-expression-using-pathsolver/87496/4 "2022-09-19T22:31:23Z")
> I am just running the code using Visual Studio Code software with Julia as language.
Sure. But literally, what buttons did you press/commands did you run to execute the file?
I typically work with the Julia REPL, and execute files using `include`:
> **[Getting started with Julia · JuMP](https://jump.dev/JuMP.jl/dev/tutorials/getting_started/getting_started_with_julia/#The-Julia-REPL)**
>
> Documentation for JuMP.
---
### Author:  [@Muhammad\_Nadeem](https://discourse.julialang.org/u/Muhammad_Nadeem)
#### Post date: [September 19, 2022, 10:32pm UTC](https://discourse.julialang.org/t/error-cannot-document-the-following-expression-using-pathsolver/87496/5 "2022-09-19T22:32:43Z")
Yes the button which says, Julia: Execute active file in REPL
---
### Author:  [@odow](https://discourse.julialang.org/u/odow)
#### Post date: [September 19, 2022, 10:35pm UTC](https://discourse.julialang.org/t/error-cannot-document-the-following-expression-using-pathsolver/87496/6 "2022-09-19T22:35:04Z")
What are the lines above line 24? Do you have a block like:
```julia
"""
Here is a commennt
"""
using PathSolver
```
It looks like Julia is trying to add a docstring to `using PATHSolver`
---
### Author:  [@Muhammad\_Nadeem](https://discourse.julialang.org/u/Muhammad_Nadeem)
#### Post date: [September 19, 2022, 10:37pm UTC](https://discourse.julialang.org/t/error-cannot-document-the-following-expression-using-pathsolver/87496/7 "2022-09-19T22:37:55Z")
Oh I see. I thought it was a commented string xD. Got it. It works now. Thank you so much 🙂
---
### Author:  [@odow](https://discourse.julialang.org/u/odow)
#### Post date: [September 19, 2022, 10:39pm UTC](https://discourse.julialang.org/t/error-cannot-document-the-following-expression-using-pathsolver/87496/8 "2022-09-19T22:39:12Z")
Multiline comments are
```julia
#=
Here
is
a
multiline
comment
=#
using PATHSolver
```
---
### Author:  [@Muhammad\_Nadeem](https://discourse.julialang.org/u/Muhammad_Nadeem)
#### Post date: [September 19, 2022, 10:40pm UTC](https://discourse.julialang.org/t/error-cannot-document-the-following-expression-using-pathsolver/87496/9 "2022-09-19T22:40:04Z")
Ok perfect. Very new to Julia. Still learning the basics 🙂
---
### Author:  [@odow](https://discourse.julialang.org/u/odow)
#### Post date: [September 19, 2022, 10:42pm UTC](https://discourse.julialang.org/t/error-cannot-document-the-following-expression-using-pathsolver/87496/10 "2022-09-19T22:42:31Z")
> Very new to Julia. Still learning the basics
Welcome! These reports are actually very helpful, because it made me realize that we don’t cover comments, multiline comments, or multiline strings in our [Getting started with Julia · JuMP](https://jump.dev/JuMP.jl/dev/tutorials/getting_started/getting_started_with_julia/) tutorial.
---
### Author:  [@odow](https://discourse.julialang.org/u/odow)
#### Post date: [September 19, 2022, 10:50pm UTC](https://discourse.julialang.org/t/error-cannot-document-the-following-expression-using-pathsolver/87496/11 "2022-09-19T22:50:59Z")
I opened a PR to improve the documentation: [[docs] add comments and multiline strings to getting\_started\_with\_julia by odow · Pull Request #3085 · jump-dev/JuMP.jl · GitHub](https://github.com/jump-dev/JuMP.jl/pull/3085).
Let me know if you come across any other stumbling blocks, or have suggestions for improvements to the docs.