beacon\DBException: SQLSTATE[HY000] [2002] Cannot assign requested address
    #0 /home/www/www.com/beacon/core/DB.php(368): beacon\DB::engine()
    #1 /home/www/www.com/vendor/wj008/beacon/core/SqlSelector.php(819): beacon\DB::getOne()
    #2 /home/www/www.com/vendor/wj008/beacon/core/SqlSelector.php(834): beacon\SqlSelector->getCount()
    #3 /home/www/www.com/app/home/controller/MoCourse.php(53): beacon\SqlSelector->getPageList()
    #4 [internal function]: app\home\controller\MoCourse->indexAction()
    #5 /home/www/www.com/vendor/wj008/beacon/core/Route.php(631): ReflectionMethod->invokeArgs()
    #6 /home/www/www.com/vendor/wj008/beacon/core/Route.php(744): beacon\Route::runMethod()
    #7 /home/www/www.com/www/index.php(87): beacon\Route::run()
    #8 {main}
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