エラーメッセージ

• Deprecated function: Using null as an array offset is deprecated, use an empty string instead in Drupal\language\LanguageNegotiator->negotiateLanguage() (line 201 of core/modules/language/src/LanguageNegotiator.php).
• Deprecated function: Using null as an array offset is deprecated, use an empty string instead in Drupal\language\LanguageNegotiator->negotiateLanguage() (line 201 of core/modules/language/src/LanguageNegotiator.php).