diff --git a/um_crypto/kuwo/src/lib.rs b/um_crypto/kuwo/src/lib.rs
index ca09125..3d64679 100644
--- a/um_crypto/kuwo/src/lib.rs
+++ b/um_crypto/kuwo/src/lib.rs
@@ -1,16 +1,15 @@
+use crate::kwm_v1::CipherV1;
 use anyhow::Result;
 use byteorder::{ReadBytesExt, LE};
 use std::io::{Cursor, Read};
+use thiserror::Error;
+use umc_qmc::QMCv2Cipher;
 
 pub mod des;
 
 pub mod kwm_v1;
 pub use umc_qmc::QMCv2Cipher as CipherV2;
 
-use crate::kwm_v1::CipherV1;
-use thiserror::Error;
-use umc_qmc::QMCv2Cipher;
-
 /// Commonly used secret key for Kuwo services.
 pub const SECRET_KEY: [u8; 8] = *b"ylzsxkwm";
 
diff --git a/um_crypto/utils/src/base64.rs b/um_crypto/utils/src/base64.rs
index 5d38f52..c49fa0c 100644
--- a/um_crypto/utils/src/base64.rs
+++ b/um_crypto/utils/src/base64.rs
@@ -1,5 +1,7 @@
 use base64::engine::{DecodePaddingMode, GeneralPurpose as Base64Engine, GeneralPurposeConfig};
-use base64::{alphabet, DecodeError, Engine};
+use base64::{alphabet, Engine};
+
+pub use base64::DecodeError;
 
 /// Don't add padding when encoding, and require no padding when decoding.
 pub const ENGINE: Base64Engine = Base64Engine::new(