Error Compilling For board ESP8266 Generic Module

[manharjoshi]

i am uploading sketch given below to my esp wroom-02 board.
it is downloaded from here only.
it is showing error like this Error Compilling For ESP8266 Generic Module.
showing same error for NodeMCU(12-E).how to solve this.thanks in advance

`//************************************************************
// this is a simple example that uses the easyMesh library
//
// 1. blinks led once for every node on the mesh
// 2. blink cycle repeats every BLINK_PERIOD
// 3. sends a silly message to every node on the mesh at a random time betweew 1 and 5 seconds
// 4. prints anything it recieves to Serial.print
//
//
//************************************************************
#include <easyMesh.h>

// some gpio pin that is connected to an LED...
// on my rig, this is 5, change to the right number of your LED.
#define LED 5 // GPIO number of connected LED

#define BLINK_PERIOD 1000000 // microseconds until cycle repeat
#define BLINK_DURATION 100000 // microseconds LED is on for

#define MESH_PREFIX "whateverYouLike"
#define MESH_PASSWORD "somethingSneeky"
#define MESH_PORT 5555

easyMesh mesh;

uint32_t sendMessageTime = 0;

void setup() {
Serial.begin(115200);

pinMode( LED, OUTPUT );

//mesh.setDebugMsgTypes( ERROR | MESH_STATUS | CONNECTION | SYNC | COMMUNICATION | GENERAL | MSG_TYPES | REMOTE ); // all types on
mesh.setDebugMsgTypes( ERROR | STARTUP ); // set before init() so that you can see startup messages

mesh.init( MESH_PREFIX, MESH_PASSWORD, MESH_PORT );
mesh.setReceiveCallback( &receivedCallback );
mesh.setNewConnectionCallback( &newConnectionCallback );

randomSeed( analogRead( A0 ) );
}

void loop() {
mesh.update();

// run the blinky
bool onFlag = false;
uint32_t cycleTime = mesh.getNodeTime() % BLINK_PERIOD;
for ( uint8_t i = 0; i < ( mesh.connectionCount() + 1); i++ ) {
uint32_t onTime = BLINK_DURATION * i * 2;

if ( cycleTime > onTime && cycleTime < onTime + BLINK_DURATION )
  onFlag = true;

}
digitalWrite( LED, onFlag );

// get next random time for send message
if ( sendMessageTime == 0 ) {
sendMessageTime = mesh.getNodeTime() + random( 1000000, 5000000 );
}

// if the time is ripe, send everyone a message!
if ( sendMessageTime != 0 && sendMessageTime < mesh.getNodeTime() ){
String msg = "Hello from node ";
msg += mesh.getChipId();
mesh.sendBroadcast( msg );
sendMessageTime = 0;
}
}

void receivedCallback( uint32_t from, String &msg ) {
Serial.printf("startHere: Received from %d msg=%s\n", from, msg.c_str());
}

void newConnectionCallback( bool adopt ) {
Serial.printf("startHere: New Connection, adopt=%d\n", adopt);
}
`