fix https://github.com/Neilpang/acme.sh/issues/1905

acme.sh

@@ -4602,7 +4602,8 @@ deploy() {
 
   _initpath "$_d" "$_isEcc"
   if [ ! -d "$DOMAIN_PATH" ]; then
-    _err "Domain is not valid:'$_d'"
+    _err "The domain '$_d' is not a cert name. You must use the cert name to specify the cert to install."
+    _err "Can not find path:'$DOMAIN_PATH'"
     return 1
   fi
 
@@ -4629,7 +4630,8 @@ installcert() {
 
   _initpath "$_main_domain" "$_isEcc"
   if [ ! -d "$DOMAIN_PATH" ]; then
-    _err "Domain is not valid:'$_main_domain'"
+    _err "The domain '$_main_domain' is not a cert name. You must use the cert name to specify the cert to install."
+    _err "Can not find path:'$DOMAIN_PATH'"
     return 1
   fi