Fatal error: Uncaught Error: Interface "Composer\Plugin\PluginInterface" not found in C:\mywamp\sites\allsite\calcomposer\vendor\kylekatarnls\update-helper\src\UpdateHelper\ComposerPlugin.php:11 Stack trace: #0 {main} thrown in C:\mywamp\sites\allsite\calcomposer\vendor\kylekatarnls\update-helper\src\UpdateHelper\ComposerPlugin.php on line 11