Почему не создается миграция yii2?

php yii migrate/create add_settings_mail_columns_to_managers_table
PHP Warning:  PHP Startup: Unable to load dynamic library 'gd2' (tried: /usr/lib/php/20170718/gd2 (/usr/lib/php/20170718/gd2: cannot open shared object file: No such file or directory), /usr/lib/php/20170718/gd2.so (/usr/lib/php/20170718/gd2.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning:  Module 'zip' already loaded in Unknown on line 0
PHP Fatal error:  Cannot use 'Object' as class name as it is reserved in /home/mono0/Documents/LEMP_56/html/russiandiscovery/vendor/yiisoft/yii2/base/Object.php on line 77