# What wrong in cat ? Two simillar Arrays! ERROR: UndefRefError: access to undefined reference

**URL:** <https://discourse.julialang.org/t/what-wrong-in-cat-two-simillar-arrays-error-undefreferror-access-to-undefined-reference/22884>\
**Category:** General Usage\
**Created:** [April 7, 2019, 5:47pm UTC](https://discourse.julialang.org/t/what-wrong-in-cat-two-simillar-arrays-error-undefreferror-access-to-undefined-reference/22884 "2019-04-07T17:47:04Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![kevbonham](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/kevbonham/32/216165_2.png) [@kevbonham](https://discourse.julialang.org/u/kevbonham)\
**Post date:** [April 8, 2019, 1:45am UTC](https://discourse.julialang.org/t/what-wrong-in-cat-two-simillar-arrays-error-undefreferror-access-to-undefined-reference/22884/7 "2019-04-08T01:45:08Z")

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Just FYI, you should use backticks (``) rather than `>` to quote your code. [See here](https://discourse.julialang.org/t/psa-make-it-easier-to-help-you/14757)

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