diff --git a/tuic-client/src/connection.rs b/tuic-client/src/connection.rs
index dfb7bb3..81f94c6 100644
--- a/tuic-client/src/connection.rs
+++ b/tuic-client/src/connection.rs
@@ -1,8 +1,8 @@
 use crate::{
     config::Relay,
-    error::Error,
     socks5::Server as Socks5Server,
     utils::{self, CongestionControl, ServerAddr, UdpRelayMode},
+    Error,
 };
 use bytes::Bytes;
 use crossbeam_utils::atomic::AtomicCell;
diff --git a/tuic-client/src/error.rs b/tuic-client/src/error.rs
deleted file mode 100644
index c541e32..0000000
--- a/tuic-client/src/error.rs
+++ /dev/null
@@ -1,27 +0,0 @@
-use quinn::{ConnectError, ConnectionError};
-use std::io::Error as IoError;
-use thiserror::Error;
-use tuic_quinn::Error as ModelError;
-use webpki::Error as WebpkiError;
-
-#[derive(Debug, Error)]
-pub enum Error {
-    #[error(transparent)]
-    Io(#[from] IoError),
-    #[error(transparent)]
-    Connect(#[from] ConnectError),
-    #[error(transparent)]
-    Connection(#[from] ConnectionError),
-    #[error(transparent)]
-    Model(#[from] ModelError),
-    #[error(transparent)]
-    Webpki(#[from] WebpkiError),
-    #[error("timeout establishing connection")]
-    Timeout,
-    #[error("cannot resolve the server name")]
-    DnsResolve,
-    #[error("received packet from an unexpected source")]
-    WrongPacketSource,
-    #[error("invalid socks5 authentication")]
-    InvalidSocks5Auth,
-}
diff --git a/tuic-client/src/main.rs b/tuic-client/src/main.rs
index cc06f30..b1ef3a9 100644
--- a/tuic-client/src/main.rs
+++ b/tuic-client/src/main.rs
@@ -1,14 +1,16 @@
-use socks5::Server;
-
 use self::{
     config::{Config, ConfigError},
     connection::Endpoint,
+    socks5::Server,
 };
-use std::{env, process};
+use quinn::{ConnectError, ConnectionError};
+use std::{env, io::Error as IoError, process};
+use thiserror::Error;
+use tuic_quinn::Error as ModelError;
+use webpki::Error as WebpkiError;
 
 mod config;
 mod connection;
-mod error;
 mod socks5;
 mod utils;
 
@@ -44,3 +46,25 @@ async fn main() {
 
     Server::start().await;
 }
+
+#[derive(Debug, Error)]
+pub enum Error {
+    #[error(transparent)]
+    Io(#[from] IoError),
+    #[error(transparent)]
+    Connect(#[from] ConnectError),
+    #[error(transparent)]
+    Connection(#[from] ConnectionError),
+    #[error(transparent)]
+    Model(#[from] ModelError),
+    #[error(transparent)]
+    Webpki(#[from] WebpkiError),
+    #[error("timeout establishing connection")]
+    Timeout,
+    #[error("cannot resolve the server name")]
+    DnsResolve,
+    #[error("received packet from an unexpected source")]
+    WrongPacketSource,
+    #[error("invalid socks5 authentication")]
+    InvalidSocks5Auth,
+}
diff --git a/tuic-client/src/socks5.rs b/tuic-client/src/socks5.rs
index d44b58a..2b88217 100644
--- a/tuic-client/src/socks5.rs
+++ b/tuic-client/src/socks5.rs
@@ -1,4 +1,4 @@
-use crate::{config::Local, connection::Connection as TuicConnection, error::Error};
+use crate::{config::Local, connection::Connection as TuicConnection, Error};
 use bytes::Bytes;
 use once_cell::sync::OnceCell;
 use parking_lot::Mutex;
diff --git a/tuic-client/src/utils.rs b/tuic-client/src/utils.rs
index afa7695..752184a 100644
--- a/tuic-client/src/utils.rs
+++ b/tuic-client/src/utils.rs
@@ -1,4 +1,4 @@
-use crate::error::Error;
+use crate::Error;
 use rustls::{Certificate, RootCertStore};
 use rustls_pemfile::Item;
 use std::{