Error: The input data is not a complete block for Encryption and Decryption after application deployment in IIS in ASP.Net

Hello,

I'm using the below article to encrypt/decrypt password.

http://www.aspsnippets.com/Articles/Encrypt-and-Decrypt-Username-or-Password-stored-in-database-in-ASPNet-using-C-and-VBNet.aspx

When I deploy the application on my local IIS its working fine. But when I deploy the same project on a Hosting Server(mywindowshosting.com) I get an error "The input data is not a complete block". Below is my code and web.config file. Does anyone got this issue before please let me know.

Web.Config:

<?xml version="1.0"?>
<configuration>
    <connectionStrings>
      <add name="Burger_CountyConnectionStringLocal" connectionString="Data Source=sql5009.mywindowshosting.com;Initial Catalog=xxx  ; Integrated Security=false; User Id=xxx; Password=xxx;  MultipleActiveResultSets=True" providerName="System.Data.SqlClient"/>
  </connectionStrings>
    <system.web>
        <compilation debug="true" targetFramework="4.0" />
      <authentication mode="Forms">
        <forms loginUrl="login.aspx" timeout="600" slidingExpiration="true"></forms>
      </authentication>
        
    </system.web>
  <system.webServer>
    <validation validateIntegratedModeConfiguration="false"/>
    <modules runAllManagedModulesForAllRequests="true"/>
    <defaultDocument>
      <files>
        <add value="login.aspx"/>
      </files>
    </defaultDocument>
  </system.webServer>
  <machinekey validationkey="1234567890123456789012345678901234567890AAAAAAAAAA" decryptionKey="123456789012345678901234567890123456789012345678"
validation="SHA1" decryption="Auto" />
</configuration>

C# Code :

public string Decrypt(string cipherText)
        {
            string EncryptionKey = "MAKV2SPBNI99212";
            byte[] cipherBytes = Convert.FromBase64String(cipherText);
            using (Aes encryptor = Aes.Create())
            {
                Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
                encryptor.Key = pdb.GetBytes(32);
                encryptor.IV = pdb.GetBytes(16);
                using (MemoryStream ms = new MemoryStream())
                {
                    using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(cipherBytes, 0, cipherBytes.Length);
                        cs.Close();
                    }
                    cipherText = Encoding.Unicode.GetString(ms.ToArray());
                }
            }
            return cipherText;
        }

protected void btnLogin_Click(object sender, EventArgs e)
        {
            string UserName, Password;
            UserName = txtUserName.Value.Trim().ToLower();
            try
            {
                DataTable dt = UserBAL.GetUserLoginDetails(UserName);
                if (dt != null && dt.Rows.Count > 0)
                {
                    string DecryptedPassword = Decrypt(dt.Rows[0]["user_password"].ToString());
                    Password = txtPwd.Value.Trim().ToLower();
                    if (Password == DecryptedPassword)
                    {
--------
}