# What is the problem with this Julia code?
**URL:** https://discourse.julialang.org/t/what-is-the-problem-with-this-julia-code/82827
**Category:** General Usage
**Tags:** question
**Created:** [June 15, 2022, 5:50pm UTC](https://discourse.julialang.org/t/what-is-the-problem-with-this-julia-code/82827 "2022-06-15T17:50:37Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@Soldalma](https://discourse.julialang.org/u/Soldalma)
#### Post date: [June 15, 2022, 5:50pm UTC](https://discourse.julialang.org/t/what-is-the-problem-with-this-julia-code/82827/1 "2022-06-15T17:50:37Z")
I wrote a function that plots several boxplots, ordered by the orders of a factor (categorical variable). It works, but VSCode keeps telling me there is a problem in one of the lines. Would someone know the reason?
Here is the code:
```julia
using DataFrames, StatsPlots
varnames = ["Winter", "Spring", "Summer", "Fall"]
df = DataFrame(
:variable => categorical(repeat(varnames, 20), levels = varnames),
:value => rand(80)
)
function boxplot_ordered(
df::DataFrame;
variable_col::Symbol = :variable,
value_col::Symbol = :value,
plotsize::Tuple{Int64,Int64} = (800, 600) # ctrl_parms.PlotSize
)
msg = "`variable_col` is not a column name of `df`"
@assert string(variable_col) in names(df) msg
msg = "`value_col` is not a column name of `df`"
@assert string(value_col) in names(df) msg
msg = "Column `variable_col` of `df` is not categorical"
@assert typeof(df[!, variable_col]) <: CategoricalVector msg
variable_order = string.(levels(df[!, variable_col]))
v = collect(1:length(variable_order))
d = Dict(zip(variable_order, v))
dfc = select(
df,
variable_col => ByRow(x -> d[x]) => :Order,
variable_col => (x -> (string.(x))) => variable_col,
value_col,
)
p = boxplot(
dfc.Order,
dfc[!, value_col],
legend = false,
size = plotsize
)
plot!(xticks = (v, variable_order)) # THIS IS THE LINE FLAGGED AS A PROBLEM
display(p)
return p
end # boxplot_ordered
boxplot_ordered(df)
```
---
### Author:  [@PetrKryslUCSD](https://discourse.julialang.org/u/PetrKryslUCSD)
#### Post date: [June 15, 2022, 5:53pm UTC](https://discourse.julialang.org/t/what-is-the-problem-with-this-julia-code/82827/2 "2022-06-15T17:53:09Z")
I would suggest posting the error message.
---
### Author:  [@Henrique\_Becker](https://discourse.julialang.org/u/Henrique_Becker)
#### Post date: [June 15, 2022, 8:16pm UTC](https://discourse.julialang.org/t/what-is-the-problem-with-this-julia-code/82827/3 "2022-06-15T20:16:04Z")
I would assume the problem is with VSCode, and not the Julia code.
---
### Author:  [@alejandromerchan](https://discourse.julialang.org/u/alejandromerchan)
#### Post date: [June 15, 2022, 8:44pm UTC](https://discourse.julialang.org/t/what-is-the-problem-with-this-julia-code/82827/4 "2022-06-15T20:44:35Z")
Works for me. I didn’t get any error when running your code.
---
### Author:  [@A\_C](https://discourse.julialang.org/u/A_C)
#### Post date: [June 15, 2022, 9:28pm UTC](https://discourse.julialang.org/t/what-is-the-problem-with-this-julia-code/82827/5 "2022-06-15T21:28:07Z")
I think it is not an error but problem with VS code in windows. I also get the blue underline in windows but it is not present on Linux machine.
---
### Author:  [@alejandromerchan](https://discourse.julialang.org/u/alejandromerchan)
#### Post date: [June 15, 2022, 10:09pm UTC](https://discourse.julialang.org/t/what-is-the-problem-with-this-julia-code/82827/6 "2022-06-15T22:09:33Z")
I ran it on VSCode in Windows and had no issue.
---
### Author:  [@Soldalma](https://discourse.julialang.org/u/Soldalma)
#### Post date: [June 15, 2022, 10:18pm UTC](https://discourse.julialang.org/t/what-is-the-problem-with-this-julia-code/82827/7 "2022-06-15T22:18:27Z")
I don’t get an error when running the code. It is just that VSCode inserts that line in the list of Problems, with the message “Possible method call error.”
---
### Author:  [@Soldalma](https://discourse.julialang.org/u/Soldalma)
#### Post date: [June 15, 2022, 10:21pm UTC](https://discourse.julialang.org/t/what-is-the-problem-with-this-julia-code/82827/8 "2022-06-15T22:21:03Z")
The message is "“Possible method call error.” It is not an error message, The function runs with no problems. It is a Problem flagged by VSCode.
---
### Author:  [@A\_C](https://discourse.julialang.org/u/A_C)
#### Post date: [June 15, 2022, 10:23pm UTC](https://discourse.julialang.org/t/what-is-the-problem-with-this-julia-code/82827/9 "2022-06-15T22:23:57Z")
Probably related to this issue:
[https://github.com/julia-vscode/julia-vscode/issues/1576](https://github.com/julia-vscode/julia-vscode/issues/1576)
It is the problem with linter. So the code will work.