Username (e.g. [epiz_28759199])
I see this:
Is anything wrong?
The first warning is telling you that
/htdocs/wp-includes/class-wp-theme-json.php does not exist.
The “fatal error” is telling you that there was a problem with an include (relative to the warning).
Try reinstalling your theme.
It looks like some WordPress core files are missing. This can happen due to a failed automatic upgrade. This is how you can fix it:
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