我刚刚接受了几个月前在Laravel制作的一个项目。该项目还利用了Laravel Voyager-管理面板程序包。
浏览到http://example.com/admin之后，我得到了这个奇怪的错误，它从无处发生，而且我也不确定如何调试它。看起来像这样：
Fatal error: Cannot declare class Symfony\Component\HttpFoundation\AcceptHeader, because the name is already in use in /c/Users/User/Code/example-website/vendor/symfony/http-foundation/AcceptHeader.php on line 22
Fatal error: Uncaught Error: Class 'Symfony\Component\HttpFoundation\AcceptHeaderItem' not found in /c/Users/User/Code/example-website/vendor/symfony/http-foundation/AcceptHeader.php:61 Stack trace: #0 [internal function]: Symfony\Component\HttpFoundation\AcceptHeader::Symfony\Component\HttpFoundation\{closure}(Array) #1 /c/Users/User/Code/example-website/vendor/symfony/http-foundation/AcceptHeader.php(57): array_map(Object(Closure), Array) #2 /c/Users/User/Code/example-website/vendor/symfony/http-foundation/Request.php(1664): Symfony\Component\HttpFoundation\AcceptHeader::fromString('text/html,appli...') #3 /c/Users/User/Code/example-website/vendor/laravel/framework/src/Illuminate/Http/Concerns/InteractsWithContentTypes.php(54): Symfony\Component\HttpFoundation\Request->getAcceptableContentTypes() #4 /c/Users/User/Code/example-website/vendor/laravel/framework/src/Illuminate/Http/Concerns/InteractsWithContentTypes.php(44): Illuminate\Http\Request->wantsJson() #5 /c/Users/User/Code/example-website/vendor/laravel/framework/src/Illumina in /c/Users/User/Code/example-website/vendor/symfony/http-foundation/AcceptHeader.php on line 61
这个错误是非常可预期的，我从未在我的项目中（或与此相关的其他任何地方）见过。
如何调试此问题？
答案 0 :(得分：0)
作为健全性检查，删除vendor目录，然后运行composer install以重新获取依赖项，并查看错误是否已解决。如果没有，请尝试composer update来获取依赖关系的最新版本，其中可能已解决了该问题。