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Contao Install Tool: Exception: Warning: Undefined array key "deleteConfirm" #27

@Eaglemong

Description

@Eaglemong

By clicking on Contao Install Tool Exception:

vendor/craffft/css-style-selector-bundle/src/Resources/contao/dca/tl_css_style_selector.php line 86

'attributes' => 'onclick="if(!confirm('' . $GLOBALS['TL_LANG']['MSC']['deleteConfirm'] . ''))return false;Backend.getScrollOffset()"'

Stack Trace:

ErrorException:
Warning: Undefined array key "deleteConfirm"

at vendor/craffft/css-style-selector-bundle/src/Resources/contao/dca/tl_css_style_selector.php:86
at include('/var/www/html/contao/vendor/craffft/css-style-selector-bundle/src/Resources/contao/dca/tl_css_style_selector.php')
(vendor/contao/core-bundle/src/Resources/contao/library/Contao/DcaLoader.php:120)
at Contao\DcaLoader->loadDcaFiles()
(vendor/contao/core-bundle/src/Resources/contao/library/Contao/DcaLoader.php:75)
at Contao\DcaLoader->load()
(vendor/contao/core-bundle/src/Resources/contao/library/Contao/Controller.php:1448)
at Contao\Controller::loadDataContainer()
(vendor/contao/core-bundle/src/Migration/Version413/RelLightboxMigration.php:104)
at Contao\CoreBundle\Migration\Version413\RelLightboxMigration->getTargets()
(vendor/contao/core-bundle/src/Migration/Version413/RelLightboxMigration.php:43)
at Contao\CoreBundle\Migration\Version413\RelLightboxMigration->shouldRun()
(vendor/contao/core-bundle/src/Migration/MigrationCollection.php:47)
at Contao\CoreBundle\Migration\MigrationCollection->getPending()
(vendor/contao/core-bundle/src/Migration/MigrationCollection.php:68)
at Contao\CoreBundle\Migration\MigrationCollection->run()
(vendor/contao/installation-bundle/src/InstallTool.php:427)
at Contao\InstallationBundle\InstallTool->runMigrations()
(vendor/contao/installation-bundle/src/Controller/InstallationController.php:361)
at Contao\InstallationBundle\Controller\InstallationController->runDatabaseUpdates()
(vendor/contao/installation-bundle/src/Controller/InstallationController.php:96)
at Contao\InstallationBundle\Controller\InstallationController->installAction()
(vendor/symfony/http-kernel/HttpKernel.php:163)
at Symfony\Component\HttpKernel\HttpKernel->handleRaw()
(vendor/symfony/http-kernel/HttpKernel.php:75)
at Symfony\Component\HttpKernel\HttpKernel->handle()
(vendor/symfony/http-kernel/Kernel.php:202)
at Symfony\Component\HttpKernel\Kernel->handle()
(web/index.php:44)

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