while trying to update a plugin : "Fatal error: Uncaught Error: Class 'Flarum\Http\Server' not found in /opt/lampp/htdocs/b/index.php:14 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/b/index.php on line 14"
When trying to install new plugin getserror "Warning: require(vendor/autoload.php): failed to open stream: No such file or directory in /opt/lampp/htdocs/b/index.php on line 12
Fatal error: require(): Failed opening required 'vendor/autoload.php' (include_path='.:/opt/lampp/lib/php') in /opt/lampp/htdocs/b/index.php on line 12" Howto solve this?