diff --git a/pkg/util/httputils/error.go b/pkg/util/httputils/error.go
index 4d12066b244..0b9927c02a2 100644
--- a/pkg/util/httputils/error.go
+++ b/pkg/util/httputils/error.go
@@ -24,27 +24,16 @@ import (
 // class: error class
 // msg: message
 // params: message format parameters
-func NewJsonClientError(code int, class string, msg string, params ...interface{}) *JSONClientError {
-	details, err := errorMessage(msg, params...)
-	return &JSONClientError{Code: code, Class: class, Details: details, Data: err}
-}
-
-func errorMessage(msgFmt string, params ...interface{}) (string, Error) {
-	fields := make([]string, len(params))
-	for i, v := range params {
-		fields[i] = fmt.Sprint(v)
+func NewJsonClientError(code int, class string, msgFmt string, params ...interface{}) *JSONClientError {
+	details := msgFmt
+	if len(params) > 0 {
+		details = fmt.Sprintf(msgFmt, params...)
 	}
-
-	err := Error{
+	theErr := Error{
 		Id:     msgFmt,
-		Fields: fields,
-	}
-
-	msg := msgFmt
-	if len(params) > 0 {
-		msg = fmt.Sprintf(msg, params...)
+		Fields: params,
 	}
-	return msg, err
+	return &JSONClientError{Code: code, Class: class, Details: details, Data: theErr}
 }
 
 func msgFmtToTmpl(msgFmt string) string {
diff --git a/pkg/util/httputils/error_test.go b/pkg/util/httputils/error_test.go
index 26eac266502..f68855acf45 100644
--- a/pkg/util/httputils/error_test.go
+++ b/pkg/util/httputils/error_test.go
@@ -50,12 +50,6 @@ func TestVariadic(t *testing.T) {
 		},
 	}
 	for _, c := range cases {
-		t.Run(c.name, func(t *testing.T) {
-			msg, _ := errorMessage(c.msg, c.params...)
-			if msg != c.out {
-				t.Errorf("want %s, got %s", c.out, msg)
-			}
-		})
 		t.Run(c.name+"_New", func(t *testing.T) {
 			err := NewJsonClientError(400, "InputParameterError", c.msg, c.params...)
 			if err.Details != c.out {
diff --git a/pkg/util/httputils/httputils.go b/pkg/util/httputils/httputils.go
index db2b3a0283b..40d280142e6 100644
--- a/pkg/util/httputils/httputils.go
+++ b/pkg/util/httputils/httputils.go
@@ -70,8 +70,8 @@ var (
 )
 
 type Error struct {
-	Id     string   `json:"id,omitempty"`
-	Fields []string `json:"fields,omitempty"`
+	Id     string        `json:"id,omitempty"`
+	Fields []interface{} `json:"fields,omitempty"`
 }
 
 type JSONClientError struct {