javax.crypto.IllegalBlockSizeException：使用填充密码解密时，输入长度必须是16的倍数

我在java类中收到解密错误：

javax.crypto.IllegalBlockSizeException : 
    Input length must be multiple of 16 when decrypting with padded cipher.

我能做些什么来解决这个问题？

更新：

我忘了提到它正在工作一次，当第二次我试图再次执行它时，它会抛出上面提到的错误。

package com.tb.module.service;
import java.security.Key;
import java.security.spec.InvalidKeySpecException;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import sun.misc.*;

/**
 * This class is used for encrypt and decrypt the  password field.
 *
 */
public class PswdEnc {

    private static final String ALGO = "AES";
    private static final byte[] keyValue = new byte[] { 'T', 'h', 'e', 'B', 'e', 's', 't','S', 'e', 'c', 'r','e', 't', 'K', 'e', 'y' };

    public static String encrypt(String Data) throws Exception {
        Key key = generateKey();
        Cipher c = Cipher.getInstance(ALGO);
        c.init(Cipher.ENCRYPT_MODE, key);
        byte[] encVal = c.doFinal(Data.getBytes());
        String encryptedValue = new BASE64Encoder().encode(encVal);
        return encryptedValue;
    }

    public static String decrypt(String encryptedData) throws Exception {
        Key key = generateKey(); 
        Cipher c = Cipher.getInstance(ALGO);
        c.init(Cipher.DECRYPT_MODE, key);
        byte[] decordedValue = new BASE64Decoder().decodeBuffer(encryptedData);
        byte[] decValue = c.doFinal(decordedValue);
        String decryptedValue = new String(decValue);
        return decryptedValue;
    }


    private static Key generateKey() throws Exception {
        Key key = new SecretKeySpec(keyValue, ALGO);
        return key;
    }

}