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Composer error

Composer error

Hi try to down facebook for Magento 2.3.5

I have installed it and does not connect  due to the fact that I need to download through composer, and I get this error 

Warning: Unsupported declare 'strict_types' in /var/www/vhosts/jewelrynest.com/public_html/live/pub/vendor/magento/inventory-composer-installer/src/Plugin.php on line 6
PHP Parse error: syntax error, unexpected ':', expecting ';' or '{' in /var/www/vhosts/jewelrynest.com/public_html/live/pub/vendor/magento/inventory-composer-installer/src/Plugin.php on line 55

Please help

Parse error: syntax error, unexpected ':', expecting ';' or '{' in /var/www/vhosts/jewelrynest.com/public_html/live/pub/vendor/magento/inventory-composer-installer/src/Plugin.php on line 55 24m 38s 8m 28s

JewelryNest