# Unexpected ERROR: UndefVarError: a not defined

**URL:** https://discourse.julialang.org/t/unexpected-error-undefvarerror-a-not-defined/60379
**Category:** Performance
**Created:** [May 1, 2021, 12:51pm UTC](https://discourse.julialang.org/t/unexpected-error-undefvarerror-a-not-defined/60379 "2021-05-01T12:51:13Z")
**Posts on this page:** 1
**Showing post:** 7

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### Author: ![bashonubuntu](https://avatars.discourse-cdn.com/v4/letter/b/f19dbf/32.png) [@bashonubuntu](https://discourse.julialang.org/u/bashonubuntu)
#### Post date: [May 1, 2021, 4:37pm UTC](https://discourse.julialang.org/t/unexpected-error-undefvarerror-a-not-defined/60379/7 "2021-05-01T16:37:34Z")

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I think the first step here would be to paste your code in a way we can run in our machines. I realize this could be a bit more borhersome, but it will allow us to help you more quickly (and, we really want to since we’re a nice community! 🙂 )

For example

```julia
your code should be inside this 

```

Some other useful guidelines on how to post code, use discourse most efficiently etc. are also given here:

> [@Please read: make it easier to help you](https://discourse.julialang.org/t/psa-make-it-easier-to-help-you/14757):
>
> Welcome to the Julia Discourse! We are enthusiastic about helping Julia programmers, both beginner and experienced. This public service announcement (PSA) outlines best practices when asking for help. Following these points makes it easier for us to help you and more likely you’ll get a prompt, useful answer. Keywords are highlighted to make it easier to refer to specific points. Choose a descriptive title that captures the key part of your question, eg “plots with multiple axes” instead of …

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