beacon\DBException: SQLSTATE[HY000] [2002] Cannot assign requested address
    #0 /home/www/www.com/beacon/core/DB.php(355): beacon\DB::engine()
    #1 /home/www/www.com/app/school/controller/MoCourse.php(107): beacon\DB::getRow()
    #2 /home/www/www.com/app/school/controller/MoCourse.php(120): app\school\controller\MoCourse->assignDetail()
    #3 [internal function]: app\school\controller\MoCourse->detailAction()
    #4 /home/www/www.com/vendor/wj008/beacon/core/Route.php(631): ReflectionMethod->invokeArgs()
    #5 /home/www/www.com/vendor/wj008/beacon/core/Route.php(744): beacon\Route::runMethod()
    #6 /home/www/www.com/www/index.php(87): beacon\Route::run()
    #7 {main}
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