error in constructor

Implicit super constructor Provider.Service() is undefined. Must explicitly invoke another constructor

public class GPSTracker extends Service implements LocationListener{

	 final Context context;
	boolean isGPSEnable=false;
	boolean isNetworkEnable=false;
	
	boolean canGetLocation=false;
	Location location;
	double latiude;
	double longitude;
	private static final long min_time_between_updates=1000*60*1;
	private static final long min_diatance_cahnge_for_updates=10;
	
	protected LocationManager locationManager;
	
	
	
	public GPSTracker(Context context) {
	
	this.context=context;
	getlocation();
	
	}
	

	public Location getlocation(){
		try{
			locationManager=(LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
			isGPSEnable=locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
			isNetworkEnable=locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);			
			
			if (isGPSEnable&&!isNetworkEnable) {
				
			}
			else{
				
				
				this.canGetLocation=true;
				if(isNetworkEnable){
					locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,min_time_between_updates, 
							min_diatance_cahnge_for_updates,  this);
					if(locationManager!=null){
						
						location=locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
						if(location!=null){
							latiude=location.getLatitude();
							longitude=location.getLongitude();							
						}//third inner						
					}//inner second					
				}//main if
				if(isGPSEnable){
					locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,min_time_between_updates, 
							min_diatance_cahnge_for_updates,  this);
					if(locationManager!=null){
						
						location=locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
						if(location!=null){
							latiude=location.getLatitude();
							longitude=location.getLongitude();							
						}//third inner						
					}//inner second					
				}//main if
				
				
				
				
			}
			
			
			
		}catch(Exception e){			
			e.printStackTrace();			
		}