'mac was not declared in this scope'

#include <Ethernet.h>

#include <PubNub.h>



void setup() {
    /* For debugging, set to speed of your choice */
    Serial.begin(9600);

    /* If you use some other HW, you need to do some other
       initialization of it here... */
    Ethernet.begin();

    /* Start the Pubnub library by giving it a publish and subscribe
       keys */
    PubNub.begin(publisher key, subscriber key);
}

void loop() {
    /* Maintain DHCP lease. For other HW, you may need to do
       something else here, or maybe nothing at all. */
    Ethernet.maintain();

    /* Publish message. You could use `auto` here... */
    PubNonSubClient *pclient = PubNub.publish(pubchannel, ""message"");
    if (!pclient) return;
    PublishCracker cheez;
    cheez.read_and_parse(pclient);
    /** You're mostly interested in `outcome()`, and,
        if it's "failed", then `description()`.
    */
    Serial.print("Outcome: "); Serial.print(cheez.outcome());
    Serial.print(' '); Serial.println(cheez.to_str(cheez.outcome()));
    Serial.print("description: "); Serial.println(cheez.description());
    Serial.print("timestamp: "); Serial.println(cheez.timestamp());
    Serial.print("state: "); Serial.print(cheez.state());
    Serial.print(' '); Serial.println(cheez.to_str(cheez.state()));
    pclient->stop();

    /* Wait for news. */
    PubSubClient *sclient = PubNub.subscribe(subchannel);
    if (!sclient) return; // error
    String msg;
    SubscribeCracker ritz(sclient);
    while (!ritz.finished()) {
        ritz.get(msg);
        if (msg.length() > 0) {
            Serial.print("Received: "); Serial.println(msg);
        }
    }
    sclient->stop();

    delay(1000);
}



error :-
  sketch_jan17a:28:47: error: 'pubchannel' was not declared in this scope

     PubNonSubClient *pclient = PubNub.publish(pubchannel, ""message"");

                                               ^

sketch_jan17a:44:46: error: 'subchannel' was not declared in this scope

     PubSubClient *sclient = PubNub.subscribe(subchannel);

                                              ^

Multiple libraries were found for "Ethernet.h"
 Used: C:UserssultanAppDataLocalArduino15packagesesp8266hardwareesp82662.5.0-beta2librariesEthernet
 Not used: C:Program Files (x86)ArduinolibrariesEthernet
exit status 1
'mac' was not declared in this scope