yiisoft/yii2 · error · Exception

Languages cannot be empty.

Error message

Languages cannot be empty.

What it means

Error "Languages cannot be empty." thrown in yiisoft/yii2.

Source

Thrown at framework/console/controllers/MessageController.php:1002

        if (!isset($this->config['sourcePath'], $this->config['languages'])) {
            throw new Exception('The configuration file must specify "sourcePath" and "languages".');
        }
        if (!is_dir($this->config['sourcePath'])) {
            throw new Exception("The source path {$this->config['sourcePath']} is not a valid directory.");
        }
        if (empty($this->config['format']) || !in_array($this->config['format'], ['php', 'po', 'pot', 'db'])) {
            throw new Exception('Format should be either "php", "po", "pot" or "db".');
        }
        if (in_array($this->config['format'], ['php', 'po', 'pot'])) {
            if (!isset($this->config['messagePath'])) {
                throw new Exception('The configuration file must specify "messagePath".');
            }
            if (!is_dir($this->config['messagePath'])) {
                throw new Exception("The message path {$this->config['messagePath']} is not a valid directory.");
            }
        }
        if (empty($this->config['languages'])) {
            throw new Exception('Languages cannot be empty.');
        }

        if ($this->config['format'] === 'php' && $this->config['phpDocBlock'] === null) {
            $this->config['phpDocBlock'] = <<<DOCBLOCK
/**
 * Message translations.
 *
 * This file is automatically generated by 'yii {$this->id}/{$this->action->id}' command.
 * It contains the localizable messages extracted from source code.
 * You may modify this file by translating the extracted messages.
 *
 * Each array element represents the translation (value) of a message (key).
 * If the value is empty, the message is considered as not translated.
 * Messages that no longer need translation will have their translations
 * enclosed between a pair of '@@' marks.
 *
 * Message string can be used with plural forms format. Check i18n section
 * of the guide for details.

View on GitHub (pinned to 66f00d18a2)

When it happens

Trigger: Thrown at framework/console/controllers/MessageController.php:1002 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of yiisoft/yii2@66f00d18a2 (2026-08-17). Data as JSON: /api/errors/b3bedd9ef3d892b2. Report an issue: GitHub.