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Fatal error: Can’t use function return value in write …

You should upgrade your server PHP to version 7 or at least 5.6

WordPress recommended PHP 7.2, You can read here: 
https://wordpress.org/about/requirements/

Also increase your server PHP memory limit to 128M

If you can’t do it, Contact with your server support and ask for upgrading your PHP to version or above and PHP memory limit to 128M