Okay thanks! For now please try the following:
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Clear system cache by going to Data Administration app → Maintenance → Clear application cache and reload apps
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Clear browser cache using the browser cache cleaner app and just in case the cache isn’t clearing properly.
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To double check if it’s not a browser cache issue use another browser/profile which you’ve not accessed this site before, if you still see the error then it’s not a cache issue.
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If you did all the above, please open the Network tab (F12 → Network) in your browser devtools, and then click the option which shows the error, click on the red text (if there is any) in the network tab, and take a screenshot.
Thank you!