{"record":{"id":"51fb961c7c34385a","repo":"symfony/http-foundation","slug":"you-cannot-guess-the-mime-type-as-the-mime-component-is-not","errorCode":null,"errorMessage":"You cannot guess the mime type as the Mime component is not installed. Try running \"composer require symfony/mime\".","messagePattern":"You cannot guess the mime type as the Mime component is not installed\\. Try running \"composer require symfony/mime\"\\.","errorType":"exception","errorClass":"LogicException","httpStatus":null,"severity":"error","filePath":"File/File.php","lineNumber":74,"sourceCode":"    public function guessExtension(): ?string\n    {\n        if (!class_exists(MimeTypes::class)) {\n            throw new \\LogicException('You cannot guess the extension as the Mime component is not installed. Try running \"composer require symfony/mime\".');\n        }\n\n        return MimeTypes::getDefault()->getExtensions($this->getMimeType())[0] ?? null;\n    }\n\n    /**\n     * Returns the mime type of the file.\n     *\n     * The mime type is guessed using a MimeTypeGuesserInterface instance,\n     * which uses finfo_file() then the \"file\" system binary,\n     * depending on which of those are available.\n     *\n     * @see MimeTypes\n     */\n    public function getMimeType(): ?string\n    {\n        if (!class_exists(MimeTypes::class)) {\n            throw new \\LogicException('You cannot guess the mime type as the Mime component is not installed. Try running \"composer require symfony/mime\".');\n        }\n\n        return MimeTypes::getDefault()->guessMimeType($this->getPathname());\n    }","sourceCodeStart":56,"sourceCodeEnd":92,"githubUrl":"https://github.com/symfony/http-foundation/blob/5aea19cd678fa4140f6108406f1096de5e9ed6e4/File/File.php#L56-L92","documentation":"A LogicException thrown as a feature guard at the top of File::getMimeType(). It fires whenever the method is called but the symfony/mime package is absent (class_exists(MimeTypes::class) is false), meaning mime-type guessing cannot be performed at all; the environment is misconfigured, not the input.","triggerScenarios":"Thrown at File/File.php:74 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Install the Mime component: composer require symfony/mime","Wrap the call in class_exists(MimeTypes::class) check and skip or mock mime detection when the component is missing","Derive the type from the client-supplied Content-Type or a static extension map if symfony/mime cannot be added"],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"5aea19cd678fa4140f6108406f1096de5e9ed6e4","analyzedAt":"2026-09-13T01:52:22.855Z","contentChangedAt":"2026-09-13T01:52:22.855Z","schemaVersion":2},"datasetVersion":"2026-09-16T09:17:16.951Z"}