Wordpress update error

hi,
several day ago I posted a post ‘wordpress installation error’ (Wordpress installation error) on the problem encounted when installing wordpress, now the problem is solved.
But there is a new problem occurring, updating error. I tried to update wordpress 5.1 to 5.2, plug-ins and themes respectively on the update page of wordpress control panel, all failed, just returned blank page (the urls are
http://mktcmp.rf.gd/wp-admin/update-core.php?action=do-core-upgrade
http://mktcmp.rf.gd/wp-admin/update-core.php?action=do-plugin-upgrade
http://mktcmp.rf.gd/wp-admin/update-core.php?action=do-theme-upgrade
respectively.)
could have this problem solved please?

You have to upgrade manually to WordPress 5.2 by clicking on me and following the instructions.

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