The facet does not exist

Error: The requested address '/documents/facets?amp%253BclearFacets=1&amp%253BnewFacet=theme.marc%253Dsciences+de+l%2527environnement&newFacet=subjectFacet%253Dc%25C3%25A9l%25C3%25A9bration' was not found on this server.