diff --git a/AIParkingApplication/LoginForm.cs b/AIParkingApplication/LoginForm.cs
index 1da2e9b..2f03517 100644
--- a/AIParkingApplication/LoginForm.cs
+++ b/AIParkingApplication/LoginForm.cs
@@ -1,4 +1,5 @@
-using System.Drawing;
+using System;
+using System.Drawing;
 using System.IO;
 using System.Windows.Forms;
 
@@ -34,7 +35,15 @@ namespace AIParkingApplication
                 return;
             }
 
-            apiController = new ApiController(txtServerAddress.Text);
+            try
+            {
+                apiController = new ApiController(txtServerAddress.Text);
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show($"Cấu máy chủ lỗi - Kiểm tra lại tên máy chủ, kết nối máy chủ! \r\n {ex.Message}", "Lỗi khởi tạo API!", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                return;
+            }
 
             lblLoginStatus.Text = string.Empty;
             string username = txtUsername.Text;
diff --git a/AIParkingApplication/Util.cs b/AIParkingApplication/Util.cs
index 3fa948e..53106f4 100644
--- a/AIParkingApplication/Util.cs
+++ b/AIParkingApplication/Util.cs
@@ -1,10 +1,8 @@
 using Newtonsoft.Json;
-using OpenCvSharp;
 using System;
 using System.Diagnostics;
 using System.Drawing;
 using System.IO;
-using System.Net.Http;
 using System.Net.NetworkInformation;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;