minor grammar fix in error message
minor grammar fix in error message

potato/searx,dalf/searx,jibe-b/searx,pointhi/searx,pointhi/searx,potato/searx,matejc/searx,matejc/searx,matejc/searx,misnyo/searx,asciimoo/searx,jcherqui/searx,misnyo/searx,jibe-b/searx,jcherqui/searx,dalf/searx,potato/searx,dalf/searx,pointhi/searx,matejc/searx,PwnArt1st/searx,jcherqui/searx,dalf/searx,PwnArt1st/searx,asciimoo/searx,jibe-b/searx,pointhi/searx,potato/searx,misnyo/searx,misnyo/searx,asciimoo/searx,asciimoo/searx,jibe-b/searx,PwnArt1st/searx,PwnArt1st/searx,jcherqui/searx