in shape errors

Hi 

I have the following erros from In shape theme

_Auto_Install_Upgrader_Skin::feedback($string) should be compatible with WP_Upgrader_Skin::feedback($string, ...$args) in /homepages/20/d743412932/htdocs/clickandbuilds/MihaiActive/wp-content/themes/inshape-parent/theme-includes/includes/sub-includes/auto-setup/class-fw-auto-install.php on line 1871

Warning: Cannot modify header information - headers already sent by (output started at /homepages/20/d743412932/htdocs/clickandbuilds/MihaiActive/wp-content/themes/inshape-parent/theme-includes/includes/sub-includes/auto-setup/class-fw-auto-install.php:1869) in /homepages/20/d743412932/htdocs/clickandbuilds/MihaiActive/wp-includes/functions.php on line 6221

Warning: Cannot modify header information - headers already sent by (output started at /homepages/20/d743412932/htdocs/clickandbuilds/MihaiActive/wp-content/themes/inshape-parent/theme-includes/includes/sub-includes/auto-setup/class-fw-auto-install.php:1869) in /homepages/20/d743412932/htdocs/clickandbuilds/MihaiActive/wp-admin/includes/misc.php on line 1282

Warning: session_start(): Cannot start session when headers already sent in /homepages/20/d743412932/htdocs/clickandbuilds/MihaiActive/wp-content/plugins/unyson/framework/includes/hooks.php on line 229

Warning: Cannot modify header information - headers already sent by (output started at /homepages/20/d743412932/htdocs/clickandbuilds/MihaiActive/wp-content/themes/inshape-parent/theme-includes/includes/sub-includes/auto-setup/class-fw-auto-install.php:1869) in /homepages/20/d743412932/htdocs/clickandbuilds/MihaiActive/wp-admin/admin-header.php on line 9

Warning: Cannot modify header information - headers already sent by (output started at /homepages/20/d743412932/htdocs/clickandbuilds/MihaiActive/wp-content/themes/inshape-parent/theme-includes/includes/sub-includes/auto-setup/class-fw-auto-install.php:1869) in /homepages/20/d743412932/htdocs/clickandbuilds/MihaiActive/wp-includes/option.php on line 961

Warning: Cannot modify header information - headers already sent by (output started at /homepages/20/d743412932/htdocs/clickandbuilds/MihaiActive/wp-content/themes/inshape-parent/theme-includes/includes/sub-includes/auto-setup/class-fw-auto-install.php:1869) in /homepages/20/d743412932/htdocs/clickandbuilds/MihaiActive/wp-includes/option.php on line 962