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? Theme Expected behavior shopify theme dev works! Actual be…

:police_car_light: There has been a patch release fixing the issue for theme dev: Version 3.87.1 solve this issue.

Same here, with 3.87.0… Need to downgrade to fix npm uninstall -g @shopify/cli npm install -g @shopify/cli@3.86.0 Although for me as soon as i encountered this issue and downgraded first time, it still persisted this error. Until i downgraded to 3.69.0 it kept happening for the whole day even wit…

Yeahh same problem for 2 days I can’t use shopify CLI

Same here. Not sure if this is a new feature or a bug? [image]

Same here. Anyone from Shopify team please reply or/and suggest what are the best option for further usage of CLI.

I’m experiencing the same issue with Shopify CLI version 3.87.0: “Failed to perform the initial theme synchronization”. Error: “number of ‘filenames’ must be less than or equal to 50” For now, my workaround was to uninstall the current version and install an earlier one: npm uninstall -g @shopify/…

I’m experiencing same issue. I updated to v3.87.0 today and “shopify theme dev” doesn´t work. First error was “The input array size of 288 is greater than the maximum allowed of 250”, after deleting some obsolete files and reaching less than 250, the error changed to “number of filenames must be les…

Cannot `dev` theme

Shopify CLI and Libraries

Gray-Shopify November 10, 2025, 5:50pm 8

Please let me know if this fixed it: Shopify Theme Dev syncs endlessly - #17 by AlokSwamy

Topic		Replies	Views
Shopify Theme Dev - 502 Error - Failed to perform theme synchronization Shopify CLI and Libraries theme-commands	18	508	March 25, 2026
Shopify Theme Dev syncs endlessly Shopify CLI and Libraries theme-commands	17	470	November 10, 2025
Failed after upgrade shopify cli version 3.87 Online Store and Theme Development cli-themes	3	88	November 10, 2025
Getting theme error when opening dev theme Shopify CLI and Libraries app-commands	3	145	October 6, 2025
Shopify CLI Error: "Failed to perform the initial theme synchronization" (Internal Server Error) Shopify App Store app-store	0	81	October 14, 2025

Cannot `dev` theme

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