Magento 2.4 Uncaught Error: Cannot instantiate interface

Question

I was trying to upgrade from magento 2.3.6 to 2.4.2.

Now I have an issue that any php bin/magento command is giving an error:

PHP Fatal error: Uncaught Error: Cannot instantiate interface Magento\Framework\Interception\ConfigLoaderInterface in /var/www/html/vendor/magento/framework/ObjectManager/Factory/Dynamic/Developer.php:50
Stack trace:
#0 /var/www/html/vendor/magento/framework/ObjectManager/ObjectManager.php(70): Magento\Framework\ObjectManager\Factory\Dynamic\Developer->create()
#1 /var/www/html/vendor/magento/framework/Interception/PluginList/PluginList.php(136): Magento\Framework\ObjectManager\ObjectManager->get()
#2 /var/www/html/vendor/magento/framework/ObjectManager/Factory/AbstractFactory.php(121): Magento\Framework\Interception\PluginList\PluginList->__construct()
#3 /var/www/html/vendor/magento/framework/ObjectManager/Factory/Dynamic/Developer.php(66): Magento\Framework\ObjectManager\Factory\AbstractFactory->createObject()
#4 /var/www/html/vendor/magento/framework/ObjectManager/ObjectManager.php(70): Magento\Framework\ObjectManager\Factory\Dynamic\Developer->create()
#5 /var/www/html/vendor/magento/framework/Interception/Interceptor.ph in /var/www/html/vendor/magento/framework/ObjectManager/Factory/Dynamic/Developer.php on line 50

I tried things like clear cache, redis flushall, but nothing helps. Any way to fix this?

• Gohil Rajesh: what php version you are using? please switch to 7.4 if not yet switched
• justadev: usign PHP 7.4.20
• Diana: have you tried clearing the generated/code folder?
• Corinne: Had the exact same issue, tried all the above. I realized it was most likely stubborn OPCACHE. If you're smarter than me, you can figure out a way to flush that. I find that rebooting the server is the quickest way to get it done.
• Mukesh Chapagain: Related: magento.stackexchange.com/questions/91294/…

Answer 1

Check your app/etc/di.xml.

I had the same error and it looked like the absence of this line:

<preference for="Magento\Framework\Interception\ConfigLoaderInterface" type="Magento\Framework\Interception\PluginListGenerator" />

At the bottom of the preferences block. This was what was causing the Fatal Error message in my case.

However, the best thing to do is merge your di.xml with the 2.4 release di.xml.

I know it's been 7 months since you asked this question, so I hope this helps someone.

• Giles Bennett: It helped me, so thank you for that.

Answer 2

What solved this for me was regenerating composer:

rm -rf vendor/*
composer clearcache
composer install
then compile magento (setup upgrade.... cache flush)

• Gohil Rajesh: Happy to hear you fixed it
• Kapil Dev Singh: This should be the accepted answer

Answer 3

After hours of research, I found that it can be fixed by a few options:

Solution 1:

rm -rf vendor generated
composer install
php bin/magento setup:upgrade
php bin/magento setup:di:compile

Solution 2: Flush Redis Cache

redis-cli flushall

Answer 4

I faced the same problem.

I just ran the "composer install" command and got it fixed.

Answer 5

Quickest solution for me was to remove vendor, run composer update and then setup:upgrade. Resolved issue within 2 minutes

rm -fr vendor
composer update
setup:upgrade

• Mohd Farhan Bin Ramli: This didnt solve my error - Cannot instantiate interface Magento\JwtUserToken\Model\JwtSettingsProviderInterface in /var/www/html/wowshop/vendor/magento/framework/ObjectManager/Factory/AbstractFactory.php:121

Answer 6

Issue is probably down to accidentally uploading an incorrect version of etc/di.xml. Got the same after I made a change then realised my local copy was out of date! Restored the correct di.xml, made the change to that and all good.