# UI Extensions Quick Start Guide Failed to upload project files **URL:** \ **Category:** APIs & Integrations\ **Tags:** timeline-and-extensions-apis\ **Created:** [April 3, 2024, 9:33pm UTC](https://community.hubspot.com/t/ui-extensions-quick-start-guide-failed-to-upload-project-files/104059 "2024-04-03T21:33:38Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![AMichaels](https://d10pqhm3lwygmk.cloudfront.net/user_avatar/community.hubspot.com/amichaels/32/202196_2.png) [@AMichaels](https://community.hubspot.com/u/AMichaels)\ **Post date:** [April 3, 2024, 9:33pm UTC](https://community.hubspot.com/t/ui-extensions-quick-start-guide-failed-to-upload-project-files/104059/1 "2024-04-03T21:33:38Z")
I’m following the [guide posted here](https://developers.hubspot.com/docs/platform/ui-extensions-quickstart). On the third step I get the error below. Can you give me any suggestions for troubleshooting? ![hsui.png](https://d2qpr2jzcazej7.cloudfront.net/original/3X/9/f/9fb5644ea665eda1beb25d67d044506552550d50.png) sad face ---
**Author:** ![Berangere](https://d10pqhm3lwygmk.cloudfront.net/user_avatar/community.hubspot.com/berangere/32/220784_2.png) [@Berangere](https://community.hubspot.com/u/Berangere)\ **Post date:** [April 5, 2024, 7:26am UTC](https://community.hubspot.com/t/ui-extensions-quick-start-guide-failed-to-upload-project-files/104059/2 "2024-04-05T07:26:52Z")
Hi @AMichaels, Thank you for reaching out to the Community! Have you[opted in for this “UI Extensions quickstart guide” Beta](https://knowledge.hubspot.com/account-management/opt-your-hubspot-account-into-a-public-beta-feature), please? Because this may be the reason why you are seeing the error. Also, are you a Super Admin? I’d like to invite a couple of subject matter experts and Community Members to this conversation: Hi [@Bradley\_B](https://community.hubspot.com/t5/user/viewprofilepage/user-id/652900), @VladT, @Sambo and [@zach\_threadint](https://community.hubspot.com/t5/user/viewprofilepage/user-id/324811) do you have suggestions to help @AMichaels, please? If anybody else has anything to add and/or share, please feel free to join in the conversation 🙂 Thanks a lot and have a great day! Best, Bérangère ---
**Author:** ![AMichaels](https://d10pqhm3lwygmk.cloudfront.net/user_avatar/community.hubspot.com/amichaels/32/202196_2.png) [@AMichaels](https://community.hubspot.com/u/AMichaels)\ **Post date:** [April 5, 2024, 1:00pm UTC](https://community.hubspot.com/t/ui-extensions-quick-start-guide-failed-to-upload-project-files/104059/3 "2024-04-05T13:00:55Z")
Thank you - I had not opted in to the Beta, that solved the issue. I appreciate the reply. ---
**Author:** ![SoorajRawat](https://avatars.discourse-cdn.com/v4/letter/s/7ab992/32.png) [@SoorajRawat](https://community.hubspot.com/u/SoorajRawat)\ **Post date:** [June 3, 2024, 6:20pm UTC](https://community.hubspot.com/t/ui-extensions-quick-start-guide-failed-to-upload-project-files/104059/4 "2024-06-03T18:20:51Z")
Hi [@BérangèreL](https://community.hubspot.com/t5/user/viewprofilepage/user-id/230185), which beta should I opt into or request to be able to start working in UI Extension. I am also getting the same error ---
**Author:** ![MYou1](https://avatars.discourse-cdn.com/v4/letter/m/bc8723/32.png) [@MYou1](https://community.hubspot.com/u/MYou1)\ **Post date:** [August 8, 2024, 6:50am UTC](https://community.hubspot.com/t/ui-extensions-quick-start-guide-failed-to-upload-project-files/104059/5 "2024-08-08T06:50:03Z")
I have this error too. How do you resolve this error? Could you let me know your solution? ---
**Author:** ![AMichaels](https://d10pqhm3lwygmk.cloudfront.net/user_avatar/community.hubspot.com/amichaels/32/202196_2.png) [@AMichaels](https://community.hubspot.com/u/AMichaels)\ **Post date:** [August 8, 2024, 1:59pm UTC](https://community.hubspot.com/t/ui-extensions-quick-start-guide-failed-to-upload-project-files/104059/6 "2024-08-08T13:59:05Z")
I [opted in for this “UI Extensions quickstart guide” Beta](https://knowledge.hubspot.com/account-management/opt-your-hubspot-account-into-a-public-beta-feature) and that resolved the issue.