Sql connexion error : SQLSTATE[HY000] [2002] Cannot assign requested address
Error number : 2002

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Fatal error: Uncaught Error: Call to a member function query() on null in /home/web/musicbusiness/api/lib/class.MYSQL.php:42 Stack trace: #0 /home/web/musicbusiness/api/1.1/productPack.php(47): MYSQL->set_UTF8() #1 /home/web/sm/dev-sm/src/Classes/MB/MB.php(141): include('/home/web/music...') #2 /home/web/sm/dev-sm/src/Classes/MB/MB.php(89): App\Classes\MB\MB->requestMB() #3 /home/web/sm/dev-sm/src/Classes/MB/Product.php(267): App\Classes\MB\MB->__call() #4 /home/web/sm/dev-sm/src/Controllers/product.php(425): App\Classes\MB\Product::getPacks() #5 /home/web/sm/dev-sm/public/index.php(563): require('/home/web/sm/de...') #6 {main} thrown in /home/web/musicbusiness/api/lib/class.MYSQL.php on line 42