There is a problem with the app block. Contact the app developer.

Retired Boards Appdev Extensions

Topic summary

Developers are experiencing an error when using deep linking to add theme app extension blocks: “There is a problem with the app block. Contact the app developer.” The issue appears inconsistently and has specific triggers.

Key findings:

  • Error occurs primarily when installing blocks on new themes (not previously used themes)
  • The problem may involve using incorrect extension UUIDs for different environments (staging vs. production)
  • Deep links redirect users to the wrong page (e.g., Home page instead of Product page)

Workarounds identified:

  1. UUID retrieval method: Add the extension via theme editor, access the theme’s code editor, open the relevant template file (e.g., templates/product.json), and extract the correct UUID from the markup
  2. Cookie permissions fix: Enable third-party cookies for admin.shopify.com in browser settings (Safari, Chrome, Firefox). One user confirmed this resolved their issue completely.

Status:

  • Shopify team (Liam) acknowledged the issue and is investigating
  • No official fix available yet
  • Multiple merchants are reporting the problem, causing frustration for app developers
Summarized with AI on November 5. AI used: claude-sonnet-4-5-20250929.
42

Hello Liam,

I have been having this same problem with my deep link. However, I think I’ve finally found the cause, or related at least. It has to do with the default language setting of the store. When it the default is ‘English’, the deep link works without issues. However, when the default language is set to ‘Japanese’ for example, the deep link error happens every time. Is there any way you can pass this along so that there is finally some hope to get this fixed? Or some solution to this?

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