Unity To Flash 'NumberStyles' error

Hi again!

I have two functions in C#:

    public static string ToHexString(byte[] bytes)
    {
        StringBuilder sb = new StringBuilder();
        foreach (byte b in bytes) { sb.Append(b.ToString("X2")); }
        return sb.ToString();
    }


    public static byte[] FromHexString(String hexString)
    {
        byte[] bytes = new byte[hexString.Length / 2];
        for (int i = 0; i < bytes.Length; i++)
        {
            string hexByte = hexString.Substring(i * 2, 2);
            bytes[i] = byte.Parse(hexByte, System.Globalization.NumberStyles.HexNumber);
        }
        return bytes;
    }

When I test it in editor everything works fine.
When I try to export it as Flash I get the error:
Call to a possibly undefined method Parse_String_NumberStyles through a reference with static type Class.

In the corresponding Actionscript (.as) file which I can find in the Temp folder when trying to build in Flash I can see that the FromHexString function is transformed to this one:

	public static function ComManagerScript_FromHexString_String($hexString: String): CLIByteArray {
			var $array: CLIByteArray = CLIArrayFactory.NewByteArrayWithLength(int($hexString.length / 2));
			for (var $i: int = 0; $i < $array.Length; $i = $i + 1) {
				var $s: String = StringOperations2.String_Substring_Int32_Int32($hexString, $i * 2, 2);
				$array.elements[$i] = int.Parse_String_NumberStyles($s, NumberStyles.HexNumber);
			}
			return $array;
		}

I tried not to make the class static but the error remains.
It seems like there is a problem with the NumberStyles or some other incompatibility when trying to build the flash.
Just to mention that ToHexString function does not give me errors.

I use the latest Unity Pro (4.0.1) and I saw here:
http://unity3d.com/unity/preview/notes
that since 3.5 there is: Flash: Initial support for int.Parse(string, NumberStyles).

Any suggestions will be appreciated.

Thank you in advance.

Am I the only one facing such problems with flash build?? If so… an expert may shed some light on my darkness…

Thank you for your time.

Panos.