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Fatal error: require(): Failed opening required '/usr/share/doc/php-json-schema/examples/../vendor/autoload.php' (include_path='.:/usr/share/php:/usr/local/include/php/navigami/config:/usr/local/include/php/navigami/nucleo:/usr/local/lib/php:/usr/local/lib/php/config') in /usr/share/doc/php-json-schema/examples/demo.php on line 3