J'ai réussi à reproduire le souci après avoir vidé le cache, voici l'erreur quand j'essaye d'entrer les paramètres dans le module Paypal dans le back-office:
FatalThrowableError in ParserContext.php line 224: Fatal error: Class 'Thelia\Core\Template\FormError' not found
in ParserContext.php line 224
at ParserContext->getForm('paypal.form.configure', 'Paypal\Form\ConfigurationForm', 'form') in Form.php line 127
at Form->generateForm(array('name' => 'paypal.form.configure'), null, object(Smarty_Internal_Template), true) in 57ad34b34c792711b3dbc6746211846a88b1440c.file.module-configuration.html.php line 56
at content_5ae9ea63b4bda7_46423818(object(Smarty_Internal_Template)) in smarty_internal_templatebase.php line 188
at Smarty_Internal_TemplateBase->fetch('file:/home/lemonimphz/www/local/modules/Paypal/templates/backOffice/default/paypal/module-configuration.html') in SmartyParser.php line 381
at SmartyParser->internalRenderer('file', '/home/lemonimphz/www/local/modules/Paypal/templates/backOffice/default/paypal/module-configuration.html', array('trace_content' => 'Le fichier de log est vide.', 'locale' => 'fr_FR', 'lang_code' => 'fr', 'lang_id' => '1', 'current_url' => 'https://www.lemonimport.com/index_dev.php/admin/module/Paypal', 'app' => object(stdClass)), true) in SmartyParser.php line 424
at SmartyParser->render('/home/lemonimphz/www/local/modules/Paypal/templates/backOffice/default/paypal/module-configuration.html', array('trace_content' => 'Le fichier de log est vide.', 'locale' => 'fr_FR', 'lang_code' => 'fr', 'lang_id' => '1', 'current_url' => 'https://www.lemonimport.com/index_dev.php/admin/module/Paypal', 'app' => object(stdClass))) in BaseHook.php line 140
at BaseHook->render('paypal/module-configuration.html', array('trace_content' => 'Le fichier de log est vide.')) in HookManager.php line 78
at HookManager->onModuleConfigure(object(HookRenderEvent), 'hook.2.module.configuration.26', object(ContainerAwareEventDispatcher))
at call_user_func(array(object(HookManager), 'onModuleConfigure'), object(HookRenderEvent), 'hook.2.module.configuration.26', object(ContainerAwareEventDispatcher)) in EventDispatcher.php line 181
at EventDispatcher->doDispatch(array(array(object(HookManager), 'onModuleConfigure')), 'hook.2.module.configuration.26', object(HookRenderEvent)) in EventDispatcher.php line 46
at EventDispatcher->dispatch('hook.2.module.configuration.26', object(HookRenderEvent)) in Hook.php line 106
at Hook->processHookFunction(array('name' => 'module.configuration', 'location' => 'module_configuration', 'modulecode' => 'Paypal'), object(Smarty_Internal_Template)) in 2ae43b323f7e0f41fb7c3e358ce6767ccf9e09c8.file.module-configure.html.php line 255
at content_5ae9ea6385eb56_54452872(object(Smarty_Internal_Template)) in smarty_internal_templatebase.php line 188
at Smarty_Internal_TemplateBase->fetch('file:module-configure.html') in SmartyParser.php line 381
at SmartyParser->internalRenderer('file', 'module-configure.html', array('module_code' => 'Paypal', 'edit_language_id' => '1', 'edit_language_locale' => 'fr_FR', 'edit_currency_id' => '1', 'locale' => 'fr_FR', 'lang_code' => 'fr', 'lang_id' => '1', 'current_url' => 'https://www.lemonimport.com/index_dev.php/admin/module/Paypal', 'app' => object(stdClass)), true) in SmartyParser.php line 424
at SmartyParser->render('module-configure.html', array('module_code' => 'Paypal', 'edit_language_id' => '1', 'edit_language_locale' => 'fr_FR', 'edit_currency_id' => '1', 'locale' => 'fr_FR', 'lang_code' => 'fr', 'lang_id' => '1', 'current_url' => 'https://www.lemonimport.com/index_dev.php/admin/module/Paypal', 'app' => object(stdClass))) in BaseAdminController.php line 390
at BaseAdminController->renderRaw('module-configure.html', array('module_code' => 'Paypal', 'edit_language_id' => '1', 'edit_language_locale' => 'fr_FR', 'edit_currency_id' => '1')) in BaseAdminController.php line 346
at BaseAdminController->render('module-configure', array('module_code' => 'Paypal')) in ModuleController.php line 238
at ModuleController->configureAction('Paypal')
at call_user_func_array(array(object(ModuleController), 'configureAction'), array('Paypal')) in HttpKernel.php line 139
at HttpKernel->handleRaw(object(Request), '1') in HttpKernel.php line 62
at HttpKernel->handle(object(Request), '1', true) in TheliaHttpKernel.php line 76
at TheliaHttpKernel->handle(object(Request), '1', true) in ParamInitMiddleware.php line 87
at ParamInitMiddleware->handle(object(Request), '1', true) in SessionMiddleware.php line 80
at SessionMiddleware->handle(object(Request), '1', true) in StackedHttpKernel.php line 23
at StackedHttpKernel->handle(object(Request), '1', true) in Kernel.php line 185
at Kernel->handle(object(Request)) in index_dev.php line 37