Twitter direct message with OAuth

Projects Networking, Protocols, and Devices
1

i m using OAuth library for Twitter autentication,
here is the library: https://github.com/ReturnPath/contextio-arduino i have dadapted to wifishield
here is the code:

#include <EEPROM.h>

#include <SPI.h>

#include <Time.h>

//#include <Dhcp.h>
//#include <Dns.h>
#include <WiFi.h>
#include <OAuth.h>
//#include <sha1.h>
//#include <iterator>
#include <map>
uint8_t server_ip=(199,59,150,39);
char buffer[512];
OAuth twitter(buffer,sizeof(buffer));
char ssid[]="*********";
char pass[]="*****************";
const char server[]="api.twitter.com";
const  char uri1[]="/1.1/direct_messages/new.json";
const static char consumer_key[] PROGMEM ="*************************";
const static char consumer_secret[] PROGMEM="*******************************************";
char*body = "PROBANDO MENSAJE DIRECTO";


WiFiClient client;
void setup()
{
   WiFi.begin(ssid,pass);
   Serial.begin(9600);
   Serial.println("connecting to wlan ...");
   delay(1000); 
   twitter.set_endpoint(PSTR("api.twitter.com"),PSTR("/1.1/direct_messages/new.json"), server_ip, 80, false);
   twitter.set_client_id(consumer_key,consumer_secret);
   twitter.set_account_id(PSTR("************************************"),PSTR("********************************************"));
   twitter.set_account_id(256, 384);
    if (twitter.is_ready())
    {
      Serial.println("twitter is ready");
      std::map<const char *, const char *> *param;
     char screen_name[]="**************";
      (*param)["screen_name"] = screen_name;
      if(twitter.post(server,uri1,param,body))
      {
        Serial.println("mensaje enviado");
      };
    }
    else
    {
      Serial.println("bad connection");
    }
 
}

void loop()
{
    
   if(timeStatus()!= timeNotSet) 
  {
    digitalClockDisplay();  
 }
  if(timeStatus()!= timeNotSet) 
  {
    digitalClockDisplay();  
  }
  delay(60000);
}
void printDigits(int digits){
  // utility function for digital clock display: prints preceding colon and leading 0
  Serial.print(":");
  if(digits < 10)
  Serial.print('0');
  Serial.print(digits);
}
void digitalClockDisplay(){
  // digital clock display of the time
  Serial.print(hour());
  printDigits(minute());
  printDigits(second());
  Serial.print(" ");
  Serial.print(dayStr(weekday()));
  Serial.print(" ");
  Serial.print(day());
  Serial.print(" ");
  Serial.print(monthShortStr(month()));
  Serial.print(" ");
  Serial.print(year()); 
  Serial.println(); 
}

when i compile it i have this error:

OAuthejemplo.cpp.o: In function _Construct<std::pair<const char* const, const char*>, std::pair<const char* const, const char*> >': d:/etsit sistemas electronicos/arduino-1.0.3/hardware/tools/avr/lib/gcc/../../avr/include/stl_construct.h:48: undefined reference to operator new(unsigned int, void*)'

any help please