我们在提供商 wpengine 上安装了 WordPress。当我们尝试更新某些插件时，我们在主题中遇到致命的 PHP 错误。提供商支持不知道如何帮助我们。这是错误的调用堆栈：
“PHP 致命错误：未捕获错误：调用 /nas/content/live/sillaindustrie/wp-includes/class-wp-textdomain-registry.php:103\n堆栈跟踪：\n#0 /nas 中未定义的函数 Trailingslashit() /content/live/sillaindustrie/wp-includes/l10n.php(784): WP_Textdomain_Registry->set('default', 'it_IT', '/nas/content/li...')\n#1 /nas/ content/live/sillaindustrie/wp-includes/load.php(1401): load_textdomain('default', '/nas/content/li...', 'it_IT')\n#2 /nas/content/live/ sillaindustrie/wp-includes/load.php(278): wp_load_translations_early()\n#3 /nas/content/live/sillaindustrie/wp-settings.php(74): wp_maintenance()\n#4 /nas/content/ live/sillaindustrie/wp-config.php(67): require_once('/nas/content/li...')\n#5 /nas/content/live/sillaindustrie/wp-load.php(50): require_once ('/nas/content/li...')\n#6 /nas/content/live/sillaindustrie/wp-blog-header.php(13): require_once('/nas/content/li...' )\n#7 /nas/content/live/sillaindustrie/index.php(17): require('/nas/content/li...')\n#8 {main}\n 放入 /nas/content /live/sillaindustrie/wp-includes/class-wp-textdomain-registry.php 第 103 行，参考：https://silla.industries/wp-admin/update-core.php?action=do-plugin-upgrade"
它似乎与 WPML 插件或类似相关，有什么建议吗？谢谢G。
我尝试更新 WordPress 插件，但我无法理解错误的来源。也许是插件不兼容，但我不知道如何发现它。