Need a litle Help

Hi all , if same one know and can help me need to explain me what make this :

Here it`s also the code in C# for plp who know more beter how to use C# :

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public static string encrypt(string val)
{
byte[] bytes = Encoding.UTF8.GetBytes(val);
MD5CryptoServiceProvider provider = new MD5CryptoServiceProvider();
byte[] buffer2 = provider.ComputeHash(Encoding.UTF8.GetBytes("CuUlOnGcUiBaP"));
provider.Clear();
TripleDESCryptoServiceProvider provider2 = new TripleDESCryptoServiceProvider {
Key = buffer2,
Mode = CipherMode.ECB,
Padding = PaddingMode.PKCS7
};
byte[] buff = provider2.CreateEncryptor().TransformFinalBlock(by tes, 0, bytes.Length);
int num = 0;
for (int i = 0; i < buff.Length; i++)
{
num += buff[i];
}
byte[] inArray = Crypt(buff, buff.Length, (byte) (num % 0xff));
provider2.Clear();
return Convert.ToBase64String(inArray, 0, inArray.Length);
}

Encript this name : CuUlOnGcUiBaP ?

Who can give me 1 hint for this error ?

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