# CategoryTitleLinkComponent is undefined
**URL:** https://meta.discourse.org/t/categorytitlelinkcomponent-is-undefined/39757
**Category:** Development
**Created:** [February 17, 2016, 10:35pm UTC](https://meta.discourse.org/t/categorytitlelinkcomponent-is-undefined/39757 "2016-02-17T22:35:51Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@stevenpslade](https://meta.discourse.org/u/stevenpslade)
#### Post date: [February 17, 2016, 10:35pm UTC](https://meta.discourse.org/t/categorytitlelinkcomponent-is-undefined/39757/1 "2016-02-17T22:35:51Z")
I just upgraded my Discourse from 1.4 to the current tests-passed.
An error that I am having trouble with after the upgrade is:
`Uncaught TypeError: Cannot read property 'reopen' of undefined` in regards to `Discourse.CategoryTitleLinkComponent.reopen` (this is in one of my plugins).
So I am trying to search for why `CategoryTitleLinkComponent` is now undefined.
Some places I’m looking are the Category controllers and `helpers/category-link.js.es6`.
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### Author:  [@sam](https://meta.discourse.org/u/sam)
#### Post date: [February 17, 2016, 10:47pm UTC](https://meta.discourse.org/t/categorytitlelinkcomponent-is-undefined/39757/2 "2016-02-17T22:47:15Z")
Have you read?
[https://meta.discourse.org/t/deprecating-es6-compatibility-layer/35821](https://meta.discourse.org/t/deprecating-es6-compatibility-layer/35821)
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### Author:  [@stevenpslade](https://meta.discourse.org/u/stevenpslade)
#### Post date: [February 17, 2016, 11:02pm UTC](https://meta.discourse.org/t/categorytitlelinkcomponent-is-undefined/39757/3 "2016-02-17T23:02:07Z")
Thanks, @sam. I just read it. Something I am going to try:
• Removing changing `Discourse.CategoryTitleLinkComponent.reopen` to just `CategoryTitleLinkComponent.reopen`