Failed to load resource: the server responded with a status of 404 (Not Found)

Hi, I just noticed (broken website – bad line brakes, formatting issues) that my website isn’t like it was. If I am loged in and if I open “Inspect element” in Google Chrome I get
“Failed to load resource: the server responded with a status of 404 (Not Found) “. Line that points to this error is: https://widgets.wp.com/languages/sl_SI.json

What can I do to repair this error?

Thank you!