The facet does not exist

Error: The requested address '/documents/facets?amp%253BclearFacets=1&amp%253BnewFacet=theme.marc%253Dsciences+de+l%2527environnement&newFacet=subjectFacet%253DStands+de+la+Facult%25C3%25A9+des+lettres+lors+de+la+Journ%25C3%25A9e+d%25E2%2580%2599information+sur+les+fili%25C3%25A8res+le+28+f%25C3%25A9vrier+2018+%25C3%25A0+Uni+Mail.' was not found on this server.