I get this error
Error: Class "\Mailchimp\Mailchimp" not found in Drupal\mailchimp\ClientFactory->createInstance() (line 154 of /home/feafccef/public_html/live/pace.run/modules/mailchimp/src/ClientFactory.php)
website/modules/mailchimp/src/ClientFactory.php(118): Drupal\mailchimp\ClientFactory->createInstance()
website/modules/mailchimp/src/ClientFactory.php(84): Drupal\mailchimp\ClientFactory->getInstance()
website/modules/mailchimp/src/ClientFactory.php(98): Drupal\mailchimp\ClientFactory->getByClassName()
website/modules/mailchimp/mailchimp.module(44): Drupal\mailchimp\ClientFactory->getByClassNameOrNull()
website/modules/mailchimp/src/Form/MailchimpAdminSettingsForm.php(126): mailchimp_get_api_object()
#5 [internal function]: Drupal\mailchimp\Form\MailchimpAdminSettingsForm->buildForm()
website/core/lib/Drupal/Core/Form/FormBuilder.php(534): call_user_func_array()
website/core/lib/Drupal/Core/Form/FormBuilder.php(281): Drupal\Core\Form\FormBuilder->retrieveForm()
website/modules/autosave_form/src/Form/AutosaveFormBuilder.php(97): Drupal\Core\Form\FormBuilder->buildForm()
website/core/lib/Drupal/Core/Controller/FormController.php(73): Drupal\autosave_form\Form\AutosaveFormBuilder->buildForm()
#10 [internal function]: Drupal\Core\Controller\FormController->getContentResult()
website/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array()
website/core/lib/Drupal/Core/Render/Renderer.php(580): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
website/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext()
website/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext()
website/vendor/symfony/http-kernel/HttpKernel.php(169): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
website/vendor/symfony/http-kernel/HttpKernel.php(81): Symfony\Component\HttpKernel\HttpKernel->handleRaw()
website/core/lib/Drupal/Core/StackMiddleware/Session.php(58): Symfony\Component\HttpKernel\HttpKernel->handle()
website/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(48): Drupal\Core\StackMiddleware\Session->handle()
website/core/modules/page_cache/src/StackMiddleware/PageCache.php(106): Drupal\Core\StackMiddleware\KernelPreHandle->handle()
website/core/modules/page_cache/src/StackMiddleware/PageCache.php(85): Drupal\page_cache\StackMiddleware\PageCache->pass()
website/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(48): Drupal\page_cache\StackMiddleware\PageCache->handle()
website/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(51): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle()
website/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle()
website/core/lib/Drupal/Core/DrupalKernel.php(718): Stack\StackedHttpKernel->handle()
website/index.php(19): Drupal\Core\DrupalKernel->handle()
#26 {main}
Closed: duplicate
2.2
General
Sounds like your Mailchimp API PHP library is not properly installed. See this issue for a fix: https://www.drupal.org/project/mailchimp/issues/3349727 🐛 Composer install of 2.2.0 fails on Drupal 10.0.5 w/o prior MailChimp Fixed . Also see the readme for more info on how to install this module properly.