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Has anybody ever seen the error `Cannot read property "0" from undefined` when trying to deploy an extension? That’s the only error message I get in Terminal and it’s not terribly helpful…

2 typical errors are:
1. Extension Manifest errors
2. upload issues with WebServices

<@U658H85S9> The closest I can get is this on the script that deploys the extension: `Error	SCE_FILE_SERVICE_ERROR	6/22/2020	1:39 pm	E166 XXXXXX	TypeError: Cannot read property "0" from undefined`

I’m getting the same issues for all my extensions when trying to deploy to production. Deploying to sandbox, however, seems to work fine.

do you have the same extension manager version on both?

Extension manager is managed, so be aware that it might be different even if you didn't mean to because sandbox doesn't get managed upgrades.

No. Production is 2020.1.2. Sandbox is 2019.2.0

Well. One thing i'd do is download the 2020.1.2 tools and try to deploy again

You can manually force a SB upgrade and break both environments to double check, too :slightly_smiling_face: