I've upgraded my Dev server from Magento 2.2.5 to 2.3

I had to install in increments by going from 2.2.5->2.2.6>2.2.7 and then on to 2.3

There were also a few modules I had to remove to get the upgrade to work.

However, now that it's all installed, when I type php bin/magento setup:upgrade I get and error which is

PHP Fatal error:  Uncaught Error: Class 'Zend\Code\Annotation\AnnotationManager' not found in /chroot/home/a7669e95/mydomain.com/html/vendor/zendframework/zend-di/src/Definition/IntrospectionStrategy.php:68
Stack trace:
#0 /chroot/home/a7669e95/mydomain.com/html/vendor/zendframework/zend-di/src/Definition/IntrospectionStrategy.php(48): Zend\Di\Definition\IntrospectionStrategy->createDefaultAnnotationManager()
#1 /chroot/home/a7669e95/mydomain.com/html/vendor/zendframework/zend-di/src/Definition/RuntimeDefinition.php(54): Zend\Di\Definition\IntrospectionStrategy->__construct()
#2 /chroot/home/a7669e95/mydomain.com/html/vendor/zendframework/zend-di/src/Di.php(116): Zend\Di\Definition\RuntimeDefinition->__construct()
#3 /chroot/home/a7669e95/mydomain.com/html/vendor/zendframework/zend-mvc/src/Service/DiFactory.php(43): Zend\Di\Di->__construct()
#4 /chroot/home/a7669e95/mydomain.com/html/vendor/zendframework/zend-mvc/src/Service/DiFactory.php(63): Zend\Mvc\Service\D in /chroot/home/a7669e95/mydomain.com/html/vendor/zendframework/zend-di/src/Definition/IntrospectionStrategy.php on line 68

I've substituted my dev domain for mydomain.com in the above.

Anybody got any ideas on what would cause this or more importantly, how I fix it?

  • Did you get it figured out? – tjjen Apr 1 at 20:57

Check the "minimum-stability" in your composer.json, in case it is not set to stable you migth be requiring an incorrect zenframework/zend-code version instead of the 3.3.1 that Magento 2.3.1 is expecting.

  • Thank you, I'll give it go. – wjpbill Apr 7 at 11:46
  • I had the same issue on 2.3.0 with minimum stability dev. Changing it to stable worked, thank you! – Fabian Schmengler May 8 at 16:25

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