I have reproduced the issue on the latest CLI version. Yes, I am on the latest version I have searched existing posts and this report is not a duplicate. Yes, this isn’t a duplicate In which of these areas are you experiencing a problem? App Expected behavior Able to run the app Actual behavior T…

Hi folks - we’ve just shipped an update which should resolve this issue. Can you please check to see if this error is no longer appearing.

Let’s wait for a patch. I’ve read that the schema tag could only be used within /sections but theme extension only allows: assets blocks snippets locales directories. I tried to convert the block that is throwing the error into a section and I got this new error: [image]

Me and my friend ripjawe are also experiencing this issue :frowning: :frowning:

I bypass this checking by remove the embed app block then run app then revert the embed app block. Use that trick to run your app and wait for Shopify to fix this issue.

I can run app by simply removing the extension but if revert back it will again show error. And I need to work on extension part. Anyone??

Liquid syntax error : Unknown tag 'schema' when running shopify app dev

Shopify CLI and Libraries

Lisandro_Phan December 16, 2025, 4:39am 32

Succeed with this work aground if we’re working admin app. Thank Harry.

Topic		Replies	Views
Shopify Theme App Extension deploy fails with Liquid syntax error: Unknown tag 'schema' even though {% schema %} is valid Extensions theme-app-extension	3	160	December 16, 2025
Liquid Syntax Error: Unknown Tag ‘Schema' Extensions theme-app-extension	3	293	December 16, 2025
Deployment failing for Theme App Extension with schema tags in Liquid files Extensions checkout-ui-ext , theme-app-extension	2	97	December 16, 2025
CLI 3.84.1+ Regression: "Unknown tag 'schema'" for app_block with require_remote_ui Shopify CLI and Libraries app-commands	4	371	December 16, 2025
Missing schema warning in snippets Extensions theme-app-extension	15	786	December 16, 2025

Liquid syntax error : Unknown tag 'schema' when running shopify app dev

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