Haven’t heard back until now.
It was a problem with this file, which was missing: /wp-content/themes/supreme/css/custom-styles.css.php
If it’s there for you, I would suggest:
a) deactivating and reactivating the theme
b) if that fails, try to re-install the theme (activate a default theme, delete Supreme, install it again). Theme options will not be lost.
Regards,
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Cosmin
Support Assistant