Fatal error: Uncaught Error: Call to a member function IPP() on null in /var/www/html/QuickBooks/IPP.php:1456 Stack trace: #0 /var/www/html/QuickBooks/IPP.php(334): QuickBooks_IPP->_request(NULL, 'ipp', 'https://workpla...', 'API_Authenticat...', '<?xml version="...') #1 /var/www/html/dev/dev_ipp_assert.php(18): QuickBooks_IPP->authenticate('keith@consoliby...', 'password', 'app token here') #2 {main} thrown in /var/www/html/QuickBooks/IPP.php on line 1456