Android Question Inconvertible types error

unsigned char[] RCON_Command(std::string Command, int ServerData)
{
    unsigned char Packet[static_cast<unsigned char>((13 + Command.length())) + 1];
    Packet[0] = Command.length() + 9; //Packet Size (Integer)
    Packet[4] = 0; //Request Id (Integer)
    Packet[8] = ServerData; //SERVERDATA_EXECCOMMAND / SERVERDATA_AUTH (Integer)
    for (int X = 0; X < Command.length(); X++)
    {
        Packet[12 + X] = System::Text::Encoding::Default->GetBytes(Command[X])[0];
    }
    return Packet;

Sub Button1_Click
    Dim SERVERAUTH() As Byte
    Dim rCON As String = "flo1993lol"
   
    SERVERAUTH(0) = rCON.Length + 13
    SERVERAUTH(4) = 0
    SERVERAUTH(8) = SERVERDATA_AUTH
    SERVERAUTH(12) = rCON.GetBytes("ascii")
    AStreams.Write(SERVERAUTH)

    ToastMessageShow("Finisched",True)
End Sub