diff --git a/cmd/dev-server/main.go b/cmd/dev-server/main.go
index eca8062..90667e3 100644
--- a/cmd/dev-server/main.go
+++ b/cmd/dev-server/main.go
@@ -3,7 +3,7 @@ package main
 import (
 	"errors"
 	"fmt"
-	"gitea.unprism.ru/KRBL/n9m"
+	"gitea.unprism.ru/KRBL/n9m/v2"
 	"io"
 	"net"
 	"os"
diff --git a/smart.go b/smart.go
index 401880f..ea7a991 100644
--- a/smart.go
+++ b/smart.go
@@ -1,10 +1,19 @@
 package n9m
 
 import (
+	"errors"
 	"fmt"
 	"net"
 )
 
+type notFoundError struct {
+	message string
+}
+
+func (e *notFoundError) Error() string {
+	return fmt.Sprintf("not found %s", e.message)
+}
+
 func NewSmartPackage(conn net.Conn) *SmartPackage {
 	return &SmartPackage{
 		pack:           Package{},
@@ -42,7 +51,9 @@ func (pack *SmartPackage) handleAlarm() (err error) {
 	var processFunc AlarmProcessFunc
 	var ok bool
 	if processFunc, ok = pack.alarmProcess[params.AlarmType]; !ok {
-		return fmt.Errorf("unhanled alarm")
+		return &notFoundError{
+			message: fmt.Sprintf("alarm %d", params.AlarmType),
+		}
 	}
 
 	var response SendAlarmInfoResponse
@@ -62,28 +73,35 @@ func (pack *SmartPackage) handleJson() (err error) {
 		return fmt.Errorf("invalid json payload type")
 	}
 
-	if err = pack.handleAlarm(); err == nil {
+	var nfErr *notFoundError
+	if err = pack.handleAlarm(); err == nil || errors.As(err, &nfErr) {
 		return
 	}
 
 	var processFunc ProcessFunc
 	var ok bool
-	if processFunc, ok = pack.jsonProcess[fmt.Sprintf("%s:%s", pack.pack.Payload.Module, pack.pack.Payload.Operation)]; !ok {
-		return fmt.Errorf("unhanled operation")
+	var key = fmt.Sprintf("%s:%s", pack.pack.Payload.Module, pack.pack.Payload.Operation)
+	if processFunc, ok = pack.jsonProcess[key]; !ok {
+		return &notFoundError{
+			message: fmt.Sprintf("json %s", key),
+		}
 	}
 
 	return processFunc(pack, pack.pack)
 }
 
 func (pack *SmartPackage) handle() (err error) {
-	if err = pack.handleJson(); err == nil {
+	var nfErr *notFoundError
+	if err = pack.handleJson(); err == nil || errors.As(err, &nfErr) {
 		return
 	}
 
 	var processFunc ProcessFunc
 	var ok bool
 	if processFunc, ok = pack.payloadProcess[pack.pack.PayloadType]; !ok {
-		return fmt.Errorf("unhanled payload type")
+		return &notFoundError{
+			message: fmt.Sprintf("payload type %d", pack.pack.PayloadType),
+		}
 	}
 
 	return processFunc(pack, pack.pack)
diff --git a/test/certificate_test.go b/test/certificate_test.go
index 3273fe5..9d5f340 100644
--- a/test/certificate_test.go
+++ b/test/certificate_test.go
@@ -2,7 +2,7 @@ package test
 
 import (
 	"fmt"
-	"gitea.unprism.ru/KRBL/n9m"
+	"gitea.unprism.ru/KRBL/n9m/v2"
 	"testing"
 )