Warning: include(//libraries/legacy/web/sql.php): failed to open stream: No such file or directory in /includes/framework.php on line 2

Warning: include(): Failed opening '//libraries/legacy/web/sql.php' for inclusion (include_path='.:/usr/local/php/pear5') in /includes/framework.php on line 2

Warning: include(//_backup_Joomla3.6.0/sql.php): failed to open stream: No such file or directory in /includes/framework.php on line 4

Warning: include(): Failed opening '//_backup_Joomla3.6.0/sql.php' for inclusion (include_path='.:/usr/local/php/pear5') in /includes/framework.php on line 4
Error displaying the error page: Application Instantiation Error: Failed to start the session because headers have already been sent by "/includes/framework.php" at line 2.