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I have just upgraded my development environment to Magento 2.3.5-p1 using:

composer require magento/product-community-edition=2.3.5-p1
composer update

Running the bin/magento command line crashes on start with a fatal error.

PHP Fatal error: Uncaught Error: Cannot instantiate interface Magento\Cron\Model\DeadlockRetrierInterface in /var/www/import/vendor/magento/framework/ObjectManager/Factory/Dynamic/Developer.php:5

After some trial & error, I have managed to find the offending code (Magento\Cron\Model\Schedule:87) and the 3rd party module that triggered it.

How do I cleanly disable the module? I cannot run bin/magento module:disable as it won't even start.

Removing it from app/etc/config.php is not sufficient. If I move the module out of the way, and empty /generated/code, it stills triggers error about missing code. 

In ClassReader.php line 26:

  Class Potato\Crawler\Model\Command\Queue does not exist
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1 Answer 1

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I didn't manage to find an answer, so I found another solution.

However, in this case, GIT to the rescue. I just reverted back and disabled the module in 2.3.4 instead. For production, I will need to do the same.

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  • Next time if you want to disable module try not to remove entry from app/etc/config.php but change the value from 1 (active) to 0 (disabled) and after that run the bin/magento setup:upgrade command in cli.
    – Adam S.
    Commented May 9, 2020 at 23:01
  • @AdamS. The problem was in being unable to run bin/magento. After the upgrade it died before it could anything, the problem being the automatic code generator throwing an exception.
    – Martijn Dijksterhuis
    Commented May 10, 2020 at 15:34

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