diff --git a/utils/errors.go b/utils/errors.go
index 0fa17f7d5..c308ae419 100644
--- a/utils/errors.go
+++ b/utils/errors.go
@@ -61,6 +61,7 @@ var (
 	ErrJsonIncompleteComment = errors.New("JSON_INCOMPLETE_COMMENT")
 	ErrCDRCNoProfileID       = errors.New("CDRC_PROFILE_WITHOUT_ID")
 	ErrCDRCNoInDir           = errors.New("CDRC_PROFILE_WITHOUT_IN_DIR")
+	ErrNotEnoughParameters   = errors.New("NotEnoughParameters")
 )
 
 // NewCGRError initialises a new CGRError
diff --git a/utils/reflect.go b/utils/reflect.go
index 935bd5dc1..8c3762006 100644
--- a/utils/reflect.go
+++ b/utils/reflect.go
@@ -325,7 +325,7 @@ func GreaterThan(item, oItem interface{}, orEqual bool) (gte bool, err error) {
 func Sum(items ...interface{}) (sum interface{}, err error) {
 	//we need at least 2 items to sum them
 	if len(items) < 2 {
-		return nil, fmt.Errorf("Not enough parameters : %d", len(items))
+		return nil, ErrNotEnoughParameters
 	}
 
 	// convert the type for first item
diff --git a/utils/reflect_test.go b/utils/reflect_test.go
index 30569f95f..6d1afd9a7 100644
--- a/utils/reflect_test.go
+++ b/utils/reflect_test.go
@@ -420,7 +420,7 @@ func TestIfaceAsBool(t *testing.T) {
 }
 
 func TestSum(t *testing.T) {
-	if _, err := Sum(1); err == nil || err.Error() != "Not enought parameters" {
+	if _, err := Sum(1); err == nil || err != ErrNotEnoughParameters {
 		t.Error(err)
 	}
 	if _, err := Sum(1, 1.2, false); err == nil || err.Error() != "incomparable" {