# How to locate an error?

**URL:** <https://discourse.julialang.org/t/how-to-locate-an-error/67274>\
**Category:** New to Julia\
**Created:** [August 29, 2021, 8:57am UTC](https://discourse.julialang.org/t/how-to-locate-an-error/67274 "2021-08-29T08:57:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![qdmj](https://avatars.discourse-cdn.com/v4/letter/q/eb9ed0/32.png) [@qdmj](https://discourse.julialang.org/u/qdmj)\
**Post date:** [August 29, 2021, 8:57am UTC](https://discourse.julialang.org/t/how-to-locate-an-error/67274/1 "2021-08-29T08:57:57Z")

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When I run my code, I got an error information like this:

> InexactError: BigFloat(6.998928493576780755780486487083180691115558147430419921875e-05 - 0.99999998593600791796376370257348753511905670166015625im)
> 
> Stacktrace:  
> [1] BigFloat(z::Complex{BigFloat})  
> @ Base .\complex.jl:37  
> [2] convert  
> @ .\number.jl:7 [inlined]  
> [3] setindex!  
> @ .\array.jl:839 [inlined]  
> [4] GSC(P::Matrix{ComplexF64}, p\_P::Int64, stop\_criteria::Float64, R\_init::Int64, R\_max::Int64, if\_polish::Bool)  
> @ Main .\In[3]:44  
> [5] GSC(P::Matrix{ComplexF64}, p\_P::Int64, stop\_criteria::Float64, R\_init::Int64, R\_max::Int64)  
> @ Main .\In[3]:31  
> [6] top-level scope  
> @ In[5]:12  
> [7] eval  
> @ .\boot.jl:360 [inlined]  
> [8] include\_string(mapexpr::typeof(REPL.softscope), mod::Module, code::String, filename::String)  
> @ Base .\loading.jl:1116

.

According to

> [6] top-level scope  
> @ In[5]:12

I can understand that the error is from the 12th line of my main code, where I invoke a function named `GSC`. Then I am confused whether the error is at the 31st or 44th line in `GSC` according to

> [4] GSC(P::Matrix{ComplexF64}, p\_P::Int64, stop\_criteria::Float64, R\_init::Int64, R\_max::Int64, if\_polish::Bool)  
> @ Main .\In[3]:44  
> [5] GSC(P::Matrix{ComplexF64}, p\_P::Int64, stop\_criteria::Float64, R\_init::Int64, R\_max::Int64)  
> @ Main .\In[3]:31

The 31st line is the beginning of the body of the function `GSC`, and this line has nothing to do with `BigFloat`. So I think the 44th line is the location of the error.

My question is that what is the meaning of these following lines in the error information?

> [7] eval  
> @ .\boot.jl:360 [inlined]  
> [8] include\_string(mapexpr::typeof(REPL.softscope), mod::Module, code::String, filename::String)  
> @ Base .\loading.jl:1116

> [5] GSC(P::Matrix{ComplexF64}, p\_P::Int64, stop\_criteria::Float64, R\_init::Int64, R\_max::Int64)  
> @ Main .\In[3]:31

---

<div class="post-metadata">

**Author:** ![Sukera](https://avatars.discourse-cdn.com/v4/letter/s/ce7236/32.png) [@Sukera](https://discourse.julialang.org/u/Sukera)\
**Post date:** [August 29, 2021, 10:37am UTC](https://discourse.julialang.org/t/how-to-locate-an-error/67274/2 "2021-08-29T10:37:16Z")

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> [@qdmj](#):
>
> The 31st line is the beginning of the body of the function `GSC` , and this line has nothing to do with `BigFloat` . So I think the 44th line is the location of the error.

`GSC` seems to recurse - line `31` is the definition of `GSC` with 5 arguments and line `44` is the definition with 6 arguments. The error seems to occur in the version with 6 arguments.

> [@qdmj](#):
>
> My question is that what is the meaning of these following lines in the error information?
> 
> > [7] eval  
> > @ .\boot.jl:360 [inlined]  
> > [8] include\_string(mapexpr::typeof(REPL.softscope), mod::Module, code::String, filename::String)  
> > @ Base .\loading.jl:1116

These are part of the julia loading/startup process.