WordPress suddenly creating theme errors

That’s a PHP warning, not technically an error, and isn’t real critical.

It’s due to your webhost updating the version of PHP; and the theme StandardTheme_272 should initialize an object before setting a property.

See if there is a theme update. If not, https://stackoverflow.com/questions/14806959/how-to-fix-creating-default-object-from-empty-value-warning-in-php for instructions on how to fix the theme.

You can temporarily suppress the warning being dumped to html by checking to see of wp_debug has been enabled in wp-config.php and disable it; see https://codex.wordpress.org/WP_DEBUG

Or, try adding this ini_set to your wp-config.php

ini_set( 'display_errors', 0 );

to suppress the warning.