Erro ao compilar - Arduino Forum

Erro ao compilar o codigo.

Boa tarde, galera.

eu estou testando meu arduino duemilanove atmega 328 + ethernet shield wiznet 5100.

Tentei compilar o seguinte código:

#include <WString.h>
#include <Ethernet.h>
/*
   Simple Ethernet Test

Arduino server outputs simple text to browser

   The circuit:
   * Arduino Duemilanove
* Arduino Ethernet shield
* Basic FTDI breakout 5V
*LED connected to GND and digital pin 4 via resistor

By Minde
   http://www.sciencprog.com/
*/

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //physical mac address
byte ip[] = { 192, 168, 1, 110 };         // ip in lan
byte gateway[] = { 192, 168, 1, 1 };         // internet access via router
byte subnet[] = { 255, 255, 255, 0 }; //subnet mask
Server server(80); //server port
byte sampledata=50; //some sample data - outputs 2 (ascii = 50 DEC)
int ledPin = 4; // LED pin
char link[]="http://www.scienceprog.com/"; //link data
String readString = String(30); //string for fetching data from address
boolean LEDON = false; //LED status flag
void setup(){
//start Ethernet
Ethernet.begin(mac, ip, gateway, subnet);
//Set pin 4 to output
pinMode(ledPin, OUTPUT);
//enable serial datada print
Serial.begin(9600);
}
void loop(){
// Create a client connection
Client client = server.available();
if (client) {
while (client.connected()) {
if (client.available()) {
char c = client.read();
//read char by char HTTP request
if (readString.length() < 30)
{
//store characters to string
readString.append(c);
}
//output chars to serial port
Serial.print(c);
//if HTTP request has ended
if (c == '\n') {
//lets check if LED should be lighted
if(readString.contains("L=1"))
{
//led has to be turned ON
digitalWrite(ledPin, HIGH); // set the LED on
LEDON = true;
}else{
//led has to be turned OFF
digitalWrite(ledPin, LOW); // set the LED OFF
LEDON = false;
}
// now output HTML data starting with standart header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println();
//set background to yellow
client.print("<body style=background-color:yellow>");
//send first heading
client.println("<font color='red'><h1>HTTP test routines</font></h1>");
client.println("<hr />");
client.println("<hr />");
//output some sample data to browser
client.println("<font color='blue' size='5'>Sample data: ");
client.print(sampledata);//lets output some data
client.println("<br />");//some space between lines
client.println("<hr />");
//drawing simple table
client.println("<font color='green'>Simple table: ");
client.println("<br />");
client.println("<table border=1><tr><td>row 1, cell 1</td><td>row 1, cell 2</td></tr>");
client.println("<tr><td>row 2, cell 1</td><td>row 2, cell 2</td></tr></table>");
client.println("<br />");
client.println("<hr />");
//printing some link
client.println("<font color='blue' size='5'>Link: ");
client.print("<a href=");
client.print(link);
client.println(">Visit Scienceprog!</a>");
client.println("<br />");
client.println("<hr />");
//controlling led via checkbox
client.println("<h1>LED control</h1>");
//address will look like http://192.168.1.110/?L=1 when submited
client.println("<form method=get name=LED><input type=checkbox name=L value=1>LED<br><input type=submit value=submit></form>");
client.println("<br />");
//printing LED status
client.print("<font size='5'>LED status: ");
if (LEDON)
client.println("<font color='green' size='5'>ON");
else
client.println("<font color='grey' size='5'>OFF");
client.println("<hr />");
client.println("<hr />");
client.println("</body></html>");
//clearing string for next read
readString="";
//stopping client
client.stop();
}
}
}
}
}

Só que ele me apresenta o seguinte erro:

ethtest.cpp: In function 'void loop()':
ethtest:46: error: 'class String' has no member named 'append'
ethtest:53: error: 'class String' has no member named 'contains'

Alguém pode me ajudar?

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