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Undefined array key instance in ArgumentsResolver.php

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This blog post was published more than one year ago and might be outdated!
· 3 min read
Stephan Hochdörfer
Head of IT Business Operations

In the last few days, I was fighting hard to understand and fix an error that occurred when trying to deploy a Magento upgrade in production for one of our merchants. During the setup:di:compile phase our CI pipeline crashed with the error Undefined array key "instance" in ArgumentsResolver.php on line 171.