Please open a ticket within your Nameless Hosting dashboard as they are a separate organisation to NamelessMC
Copied from the private conversation:
It looks like your files might somehow be corrupted.
I recommend downloading the .zip again from https://github.com/NamelessMC/Nameless/archive/refs/tags/v2.0.0-pr12.zip and performing a full reinstallation.
Unfortunately this is a bug in pre-release 12, it will be fixed in the next update
The issue here is that your template is missing a file.
If you are using the default template:
- If the issue happens on a custom module's page, you can contact the module author for support
- If the issue happens on a core page, please re-upload the custom/templates/DefaultRevamp folder (if it happens on the frontend) or custom/panel_templates/Default folder (if it happens in the staff control panel)
If you are using a custom template, you can contact the template author for support.
I'm not familiar with the custom template you are using, but Nameless provides a means for a custom template to switch the editor to dark mode.
In this case I'd recommend contacting the template author and asking them about this.