I keep getting "error compiling for board" and I don't know why .

hi i'm learning how interface arduino , android phone application arduino using hc - 06 bluetooth device. code below isn't mine, modified little bit error compiling when i'm trying verify code, meaning isn't board problem. seems right me problem serial library. can please?

code: [select]


#include <softwareserial.h>
#include <spi.h>
#include <wire.h>
#include <adafruit_ssd1306.h>
#define oled_reset 4
adafruit_ssd1306 display(oled_reset);

softwareserial bt(10, 11); //tx, rx respetively
string state;// string store incoming message bluetooth


void setup() {
 bt.begin(9600);// bluetooth serial communication happen on pin 10 , 11
 serial.begin(9600); // serial communication check data on serial monitor
 display.begin(ssd1306_switchcapvcc, 0x3c);
 display.cleardisplay();
 pinmode(13, output); // led connected 13th pin

}

void loop() {
  while (bt.available()){  //check if there available byte read
  delay(10); //delay added make thing stable
  char c = bt.read(); //conduct serial read
  state += c; //build string- either "on" or "off"
  } 
  if (state.length() > 0) {
    serial.println(state);


  if(state == "turn on")
  {
    digitalwrite(13, high);
    display.cleardisplay();
    display.settextsize(3);
    display.settextcolor(white);
    display.setcursor(0,0);
    display,println("led on!");
    display.display();
   
   
      }
 
  else if(state == "turn off")
  {
    digitalwrite(13, low);
    display.cleardisplay();
    display.settextsize(3);
    display.settextcolor(white);
    display.setcursor(0,0);
    display,println("led off!");
    display.display();
     }

     state ="";}} //reset variable


</softwareserial.h>



please copy , paste entire error message.

it if tell arduino using.

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