error ContainerConfIgurator::__construct() must be an instance of ContainerBuilder

For what it's worth, I've duplicated the bug on a clean install of Drupal 9.5.3 while attempting to scan my Sessionize Embed Block → contrib module.

Error message
Error while parsing Sessionize Embed Block 1.0.1.

Fail while processing Sessionize Embed Block 1.0.1
Raw rector output shown below for debugging purposes. If you believe the errors are due to the tool used not the code processed, look for an existing issue or submit a new one for Drupal-rector.

 [ERROR] Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator::__construct(): Argument #1
         ($container) must be of type Symfony\Component\DependencyInjection\ContainerBuilder,
         RectorPrefix202302\Symfony\Component\DependencyInjection\ContainerBuilder given, called in
         /var/www/html/vendor/rector/rector/vendor/symfony/dependency-injection/Loader/PhpFileLoader.php on line 67

The Rector project GitHub issue linked in the issue summary above contains a possible workaround, but it involves patching the rector.php file. Unfortunately, there are several rector.php files in my vendor directory, and it's not clear which one I should patch:

$ find . -name rector.php                         
./vendor/rector/rector/vendor/rector/extension-installer/rector.php
./vendor/rector/rector/vendor/rector/rector-symfony/rector.php
./vendor/rector/rector/vendor/rector/rector-doctrine/rector.php
./vendor/rector/rector/vendor/rector/rector-phpunit/rector.php
./vendor/rector/rector/vendor/rector/rector-php-parser/rector.php
./vendor/rector/rector/vendor/symplify/easy-parallel/rector.php
./vendor/rector/rector/bin/rector.php
./vendor/drush/drush/rector.php
./vendor/palantirnet/drupal-rector/rector.php

They probably mean the rector.php file in your project root.

You should also try updating to release 15, which might have fixed the issue.

Once we make newer releases, older releases are no longer supported, since Rector itself frequently introduces breaking changes.

Please update your installation and report back.

I got this error too. I had to re-run the copy for this project - cp vendor/palantirnet/drupal-rector/rector.php .

I got this error, too:

[ERROR] Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator::__construct(): Argument #1
         ($container) must be of type Symfony\Component\DependencyInjection\ContainerBuilder,
         RectorPrefix202302\Symfony\Component\DependencyInjection\ContainerBuilder given, called in
         /var/www/html/vendor/rector/rector/vendor/symfony/dependency-injection/Loader/PhpFileLoader.php on line 67

Drupal 9.5.3
rector/rector 0.15.18
palantirnet/drupal-rector: 0.15.1
drupal/upgrade_rector: 1.0.0-alpha8

It doesn't work for me. Using Drupal 9.4.10.

Can somebody please provide definitive steps to fix this issue?
Copying rector.php doesn't help.

Any solution?

Any solution?

Still an issuecd :

 [ERROR] Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConf
         igurator::__construct(): Argument #1 ($container) must be of type
         Symfony\Component\DependencyInjection\ContainerBuilder,
         RectorPrefix202304\Symfony\Component\DependencyInjection\ContainerBuild
         er given, called in
         /opt/drupal/vendor/rector/rector/vendor/symfony/dependency-injection/Lo
         ader/PhpFileLoader.php on line 67

I tried cp /opt/drupal/vendor/palantirnet/drupal-rector/rector.php /opt/drupal but to no avail.

I am also getting this same issue. Copying rector.php (cp vendor/palantirnet/drupal-rector/rector.php ) and pasted at project root but it doesn't help

[ERROR] Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator::__construct(): Argument #1
         ($container) must be of type Symfony\Component\DependencyInjection\ContainerBuilder,
         RectorPrefix202302\Symfony\Component\DependencyInjection\ContainerBuilder given, called in
         /var/www/html/vendor/rector/rector/vendor/symfony/dependency-injection/Loader/PhpFileLoader.php on line 67

Getting the same issue when running rector against a custom module, tried copying rector.php file as directed, but issue still happening in said custom module and contrib modules like Address, Admin Toolbar and GraphQL:

 [ERROR] Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator::__construct(): Argument #1
         ($container) must be of type Symfony\Component\DependencyInjection\ContainerBuilder,
         RectorPrefix202304\Symfony\Component\DependencyInjection\ContainerBuilder given, called in
         /app/vendor/rector/rector/vendor/symfony/dependency-injection/Loader/PhpFileLoader.php on line 67

Hey all,

I was able to fix this issue by copying:

cp ./vendor/palantirnet/drupal-rector/rector.php ./web/modules/contrib/upgrade_rector/rector-config-template.php

Hope it helps you all.

JonasSavs answer in #15 fixed it for us. Is that something that can be patched?

Also jumping in to say that JonasSavs answer (in #15) fixed it for me.

#15 resolved it for me, but I have also created a patch so that I can included this to make it repeatable when I install this.

I can also acknowledge that #15 fixed the issue!

Thanks #15 worked for me as well.

Seems fixed. Thanks for checking