@threadi I tried to figure out the problematic plugin using “Plugin Detective”. I tried disabling or rolling back plugin updates, but nothing worked. Then I rolled back the update to the theme “Personalblogily, ” which fixed the problem. So, it concludes that the update of the theme was not compatible with the plugin or was erroneous.
However, when I log in to WordPress I get the following error which again seems to be theme-related.
Errors:
92 bytes failed with errno=21 Is a directory in /home3/waferswi/public_html/wp-includes/pomo/streams.php on line 189
Warning: Cannot modify header information – headers already sent by (output started at /home3/waferswi/public_html/wp-includes/pomo/streams.php:189) in /home3/waferswi/public_html/wp-admin/admin-header.php on line 9