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解决方案:删除映射关系
1、vendor\composer\autoload_static.php中删除该映射关系所在行
//'CreateTopicsTable' => __DIR__ . '/../..' . '/database/migrations/2019_03_22_205815_create_topics_table.php',
2、vendor\composer\autoload_classmap.php中删除该映射关系所在行
//'CreateTopicsTable' => __DIR__ . '/../..' . '/database/migrations/2019_03_22_205815_create_topics_table.php',
3、可以了