diff --git a/tlsLayer/shadow.go b/tlsLayer/shadow.go
index 9932305..0273f33 100644
--- a/tlsLayer/shadow.go
+++ b/tlsLayer/shadow.go
@@ -66,12 +66,12 @@ func shadowTls1(servername string, clientConn net.Conn) (err error) {
 	<-finish1
 
 	if e1 != nil || e2 != nil {
-		e := utils.Errs{}
+		e := utils.ErrList{}
 		if e1 != nil {
-			e.Add(utils.ErrsItem{Index: 1, E: e1})
+			e.Add(utils.ErrItem{Index: 1, E: e1})
 		}
 		if e2 != nil {
-			e.Add(utils.ErrsItem{Index: 2, E: e2})
+			e.Add(utils.ErrItem{Index: 2, E: e2})
 		}
 
 		return e
diff --git a/utils/error.go b/utils/error.go
index 630fef8..3b043ce 100644
--- a/utils/error.go
+++ b/utils/error.go
@@ -145,22 +145,22 @@ func (e ErrInErr) String() string {
 
 }
 
-type Errs struct {
-	List []ErrsItem
+type ErrList struct {
+	List []ErrItem
 }
 
-type ErrsItem struct {
+type ErrItem struct {
 	Index int
 	E     error
 }
 
-func (ee *Errs) Add(e ErrsItem) {
+func (ee *ErrList) Add(e ErrItem) {
 	ee.List = append(ee.List, e)
 }
-func (e Errs) OK() bool {
+func (e ErrList) OK() bool {
 	return len(e.List) == 0
 }
-func (e Errs) String() string {
+func (e ErrList) String() string {
 	var sb strings.Builder
 	for _, err := range e.List {
 		sb.WriteString(strconv.Itoa(err.Index))
@@ -174,6 +174,6 @@ func (e Errs) String() string {
 	return sb.String()
 }
 
-func (e Errs) Error() string {
+func (e ErrList) Error() string {
 	return e.String()
 }
diff --git a/utils/io.go b/utils/io.go
index 589532a..8a76446 100644
--- a/utils/io.go
+++ b/utils/io.go
@@ -60,7 +60,7 @@ func ClassicCopy_detailErr(w io.Writer, r io.Reader) (written int64, err error)
 			}
 			written += int64(nw)
 			if ew != nil {
-				err = ErrInErr{ErrDetail: Errs{[]ErrsItem{{Index: 1, E: ErrInErr{ErrDetail: ew, Data: []int{nr, nw}}}, {Index: 2, E: er}}}, ErrDesc: "ew"}
+				err = ErrInErr{ErrDetail: ErrList{[]ErrItem{{Index: 1, E: ErrInErr{ErrDetail: ew}}, {Index: 2, E: er}}}, ErrDesc: "ew", Data: []int{nr, nw}}
 				break
 			}
 			if nr != nw {
@@ -286,11 +286,11 @@ type MultiCloser struct {
 
 func (cc *MultiCloser) Close() (result error) {
 	cc.Once.Do(func() {
-		var es Errs
+		var es ErrList
 		for i, c := range cc.Closers {
 			e := c.Close()
 			if e != nil {
-				es.Add(ErrsItem{Index: i, E: e})
+				es.Add(ErrItem{Index: i, E: e})
 			}
 		}
 		if !es.OK() {