Voice API TWILIO

Sample Code for the Voice API is below:

we have an error we need resolved on our java file urgently

Error: Could not find or load main class voice

// Install the Java helper library from twilio.com/docs/libraries/java
import java.net.URI;
import java.net.URISyntaxException;

import com.twilio.Twilio;
import com.twilio.rest.api.v2010.account.Call;
import com.twilio.type.PhoneNumber;

public class MakePhoneCall {
// Get your Account SID and Auth Token from https://twilio.com/console
// To set up environment variables, see http://twil.io/secure
public static final String ACCOUNT_SID = System.getenv("TWILIO_ACCOUNT_SID");
public static final String AUTH_TOKEN = System.getenv("TWILIO_AUTH_TOKEN");

public static void main(String[] args) throws URISyntaxException {
Twilio.init(ACCOUNT_SID, AUTH_TOKEN);

String from = "+15017122661";
String to = "+14155551212";

Call call = Call.creator(new PhoneNumber(to), new PhoneNumber(from),
new URI("http://demo.twilio.com/docs/voice.xml")).create();

System.out.println(call.getSid());
}
}