Fatal error: Uncaught Error: Class 'Composer\Installers\BaseInstaller' not found in D:\www\wordpress - 安裝環境+外掛測試\02.外掛程式\常用外掛\code-snippets\vendor\composer\installers\src\Composer\Installers\OxidInstaller.php:7 Stack trace: #0 {main} thrown in D:\www\wordpress - 安裝環境+外掛測試\02.外掛程式\常用外掛\code-snippets\vendor\composer\installers\src\Composer\Installers\OxidInstaller.php on line 7