# Uncaught (in promise) TypeError: Cannot set properties of undefined (setting 'i18n') at setLanguage.js:44:12 **URL:** \ **Category:** Technical Support\ **Tags:** pdfjs-express\ **Created:** [January 4, 2023, 6:48pm UTC](https://pdfjs.community/t/uncaught-in-promise-typeerror-cannot-set-properties-of-undefined-setting-i18n-at-setlanguage-js12/2271 "2023-01-04T18:48:53Z")\ **Posts on this page:** 7\ **Page:** 2
**Author:** ![benjamin.aslamy](https://avatars.discourse-cdn.com/v4/letter/b/58956e/32.png) [@benjamin.aslamy](https://pdfjs.community/u/benjamin.aslamy)\ **Post date:** [March 15, 2023, 11:13am UTC](https://pdfjs.community/t/uncaught-in-promise-typeerror-cannot-set-properties-of-undefined-setting-i18n-at-setlanguage-js12/2271/22 "2023-03-15T11:13:15Z")
Hi Has this issue been solved? I am experiencing the exact same error as well. ---
**Author:** ![kenzo.de.ridder](https://avatars.discourse-cdn.com/v4/letter/k/a87d85/32.png) [@kenzo.de.ridder](https://pdfjs.community/u/kenzo.de.ridder)\ **Post date:** [February 20, 2024, 12:26pm UTC](https://pdfjs.community/t/uncaught-in-promise-typeerror-cannot-set-properties-of-undefined-setting-i18n-at-setlanguage-js12/2271/23 "2024-02-20T12:26:13Z")
Apparently not, still experiencing the same issue in version 8.7.4. ---
**Author:** ![tgordon](https://avatars.discourse-cdn.com/v4/letter/t/aca169/32.png) [@tgordon](https://pdfjs.community/u/tgordon)\ **Post date:** [February 20, 2024, 7:51pm UTC](https://pdfjs.community/t/uncaught-in-promise-typeerror-cannot-set-properties-of-undefined-setting-i18n-at-setlanguage-js12/2271/24 "2024-02-20T19:51:58Z")
Hello, Apologies, this issue has not been resolved yet in our backlog. Best regards, Tyler ---
**Author:** ![skiiiks](https://yyz1.discourse-cdn.com/flex031/user_avatar/pdfjs.community/skiiiks/32/2207_2.png) [@skiiiks](https://pdfjs.community/u/skiiiks)\ **Post date:** [September 5, 2025, 9:50am UTC](https://pdfjs.community/t/uncaught-in-promise-typeerror-cannot-set-properties-of-undefined-setting-i18n-at-setlanguage-js12/2271/25 "2025-09-05T09:50:07Z")
Still happening ☹ 2 years … anybody ? ---
**Author:** ![skiiiks](https://yyz1.discourse-cdn.com/flex031/user_avatar/pdfjs.community/skiiiks/32/2207_2.png) [@skiiiks](https://pdfjs.community/u/skiiiks)\ **Post date:** [September 22, 2025, 7:08am UTC](https://pdfjs.community/t/uncaught-in-promise-typeerror-cannot-set-properties-of-undefined-setting-i18n-at-setlanguage-js12/2271/26 "2025-09-22T07:08:45Z")
Hello ? Anybody at home ? 😉 ---
**Author:** ![skiiiks](https://yyz1.discourse-cdn.com/flex031/user_avatar/pdfjs.community/skiiiks/32/2207_2.png) [@skiiiks](https://pdfjs.community/u/skiiiks)\ **Post date:** [November 18, 2025, 8:21pm UTC](https://pdfjs.community/t/uncaught-in-promise-typeerror-cannot-set-properties-of-undefined-setting-i18n-at-setlanguage-js12/2271/27 "2025-11-18T20:21:50Z")
Hello ? Please, anybody at Apryse ? I’d buy the pro version if it’s fixed there … but it’s not either ---
**Author:** ![tgordon](https://avatars.discourse-cdn.com/v4/letter/t/aca169/32.png) [@tgordon](https://pdfjs.community/u/tgordon)\ **Post date:** [November 19, 2025, 6:15pm UTC](https://pdfjs.community/t/uncaught-in-promise-typeerror-cannot-set-properties-of-undefined-setting-i18n-at-setlanguage-js12/2271/28 "2025-11-19T18:15:07Z")
Hello skiiiks, Apologies for the lack of communication on my end. We do not have a resolution for this issue. We strongly suggest talking with our Sales team at Apryse here [Contact Sales | Apryse](https://apryse.com/form/contact-sales) to discuss migration to our sister product WebViewer. WebViewer includes our in-house renderer and much more robust customization of the viewer and UI. Best regards, Tyler [Previous page](https://pdfjs.community/t/uncaught-in-promise-typeerror-cannot-set-properties-of-undefined-setting-i18n-at-setlanguage-js12/2271.md?page=1)