The facet does not exist

Error: The requested address '/documents/facets?amp%253BclearFacets=1&amp%253BnewFacet=subjectFacet%253Dlitt%25C3%25A9rature+africaine&newFacet=subjectFacet%253Dchirurgie+g%25C3%25A9n%25C3%25A9rale' was not found on this server.