# TypeError: Cannot read property 'lookup' of undefined 오류가 많이 발생해요

**URL:** <https://meta.discourse.org/t/a-lot-of-typeerror-cannot-read-property-lookup-of-undefined/170856>\
**Category:** Product Support\
**Created:** [11월 21, 2020, 3:28오후 UTC](https://meta.discourse.org/t/a-lot-of-typeerror-cannot-read-property-lookup-of-undefined/170856 "2020-11-21T15:28:29Z")\
**Posts on this page:** 1\
**Showing post:** 2

<div class="post-metadata">

**Author:** ![Mr.X\_Mr.X](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/mr.x_mr.x/32/126610_2.png) [@Mr.X\_Mr.X](https://meta.discourse.org/u/Mr.X_Mr.X)\
**Post date:** [1월 20, 2022, 1:11오후 UTC](https://meta.discourse.org/t/a-lot-of-typeerror-cannot-read-property-lookup-of-undefined/170856/2 "2022-01-20T13:11:59Z")

</div>

저도 같은 오류가 발생하는데, 원인이 무엇인지 전혀 모르겠습니다. 이거 심각한 문제인가요?

```plaintext
TypeError: undefined is not an object (evaluating 'this.lookup')
Uncaught TypeError: Cannot read properties of undefined (reading 'lookup')

```

```plaintext
TypeError: Cannot read properties of undefined (reading 'lookup')
    at n (https://www.domainname/assets/application-e0f95680d521105700427121a33fd1b3cbea44e92926f960e3f3b9dba7fdfdc9.js:1:422985)
    at t.invoke (https://www.domainname/assets/vendor-96a5eaa8d436066b954c21ae5afb7f504310945c679465a2f1ba46b429a95edf.js:30:405488)
    at e.t.flush (https://www.domainname/assets/vendor-96a5eaa8d436066b954c21ae5afb7f504310945c679465a2f1ba46b429a95edf.js:30:404475)
    at e.t.flush (https://www.domainname/assets/vendor-96a5eaa8d436066b954c21ae5afb7f504310945c679465a2f1ba46b429a95edf.js:30:406516)
    at e.n._end (https://www.domainname/assets/vendor-96a5eaa8d436066b954c21ae5afb7f504310945c679465a2f1ba46b429a95edf.js:30:411971)
    at e.n.end (https://www.domainname/assets/vendor-96a5eaa8d436066b954c21ae5afb7f504310945c679465a2f1ba46b429a95edf.js:30:408652)
    at e.n._run (https://www.domainname/assets/vendor-96a5eaa8d436066b954c21ae5afb7f504310945c679465a2f1ba46b429a95edf.js:30:412509)
    at e.n._join (https://www.domainname/assets/vendor-96a5eaa8d436066b954c21ae5afb7f504310945c679465a2f1ba46b429a95edf.js:30:412294)
    at e.n.join (https://www.domainname/assets/vendor-96a5eaa8d436066b954c21ae5afb7f504310945c679465a2f1ba46b429a95edf.js:30:409360)
    at h (https://www.domainname/assets/vendor-96a5eaa8d436066b954c21ae5afb7f504310945c679465a2f1ba46b429a95edf.js:30:273786)

```

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