redefinition of 'HMC5883L compass'

hello there!

i'm total newbie @ using arduino uno , i've got little problem. after connecting hmc5883l arduino , trying use compass.io github page error message. "installed" hmc5883l libary.

code: [select]

/*
  hmc5883l triple axis digital compass. compass example.
  read more: http://www.jarzebski.pl/arduino/czujniki-i-sensory/3-osiowy-magnetometr-hmc5883l.html
  git: https://github.com/jarzebski/arduino-hmc5883l
  web: http://www.jarzebski.pl
  (c) 2014 korneliusz jarzebski
*/

#include <wire.h>
#include <hmc5883l.h>

hmc5883l compass;

void setup()
{
  serial.begin(9600);

  // initialize initialize hmc5883l
  serial.println("initialize hmc5883l");
  while (!compass.begin())
  {
    serial.println("could not find valid hmc5883l sensor, check wiring!");
    delay(500);
  }

  // set measurement range
  compass.setrange(hmc5883l_range_1_3ga);

  // set measurement mode
  compass.setmeasurementmode(hmc5883l_continous);

  // set data rate
  compass.setdatarate(hmc5883l_datarate_30hz);

  // set number of samples averaged
  compass.setsamples(hmc5883l_samples_8);

  // set calibration offset. see hmc5883l_calibration.ino
  compass.setoffset(0, 0);
}

void loop()
{
  vector norm = compass.readnormalize();

  // calculate heading
  float heading = atan2(norm.yaxis, norm.xaxis);

  // set declination angle on location , fix heading
  // can find declination on: http://magnetic-declination.com/
  // (+) positive or (-) negative
  // bytom / poland declination angle 4'26e (positive)
  // formula: (deg + (min / 60.0)) / (180 / m_pi);
  float declinationangle = (4.0 + (26.0 / 60.0)) / (180 / m_pi);
  heading += declinationangle;

  // correct heading < 0deg , heading > 360deg
  if (heading < 0)
  {
    heading += 2 * pi;
  }

  if (heading > 2 * pi)
  {
    heading -= 2 * pi;
  }

  // convert degrees
  float headingdegrees = heading * 180/m_pi;

  // output
  serial.print(" heading = ");
  serial.print(heading);
  serial.print(" degress = ");
  serial.print(headingdegrees);
  serial.println();

  delay(100);
}


and complete error message:


  report have more information with
  "show verbose output during compilation"
  enabled in file > preferences.
arduino: 1.0.6 (windows nt (unknown)), board: "arduino uno"
hmc5883l_simple:12: error: redefinition of 'hmc5883l compass'
sketch_jan23a:7: error: 'hmc5883l compass' declared here
hmc5883l_simple.ino: in function 'void setup()':
hmc5883l_simple:14: error: redefinition of 'void setup()'
sketch_jan23a:17: error: 'void setup()' defined here
hmc5883l_simple:20: error: 'class hmc5883l' has no member named 'begin'
hmc5883l_simple:27: error: 'class hmc5883l' has no member named 'setrange'
hmc5883l_simple:27: error: 'hmc5883l_range_1_3ga' not declared in scope
hmc5883l_simple:30: error: 'class hmc5883l' has no member named 'setmeasurementmode'
hmc5883l_simple:30: error: 'hmc5883l_continous' not declared in scope
hmc5883l_simple:33: error: 'class hmc5883l' has no member named 'setdatarate'
hmc5883l_simple:33: error: 'hmc5883l_datarate_30hz' not declared in scope
hmc5883l_simple:36: error: 'class hmc5883l' has no member named 'setsamples'
hmc5883l_simple:36: error: 'hmc5883l_samples_8' not declared in scope
hmc5883l_simple:39: error: 'class hmc5883l' has no member named 'setoffset'
hmc5883l_simple.ino: in function 'void loop()':
hmc5883l_simple:42: error: redefinition of 'void loop()'
sketch_jan23a:36: error: 'void loop()' defined here
hmc5883l_simple:44: error: 'vector' not declared in scope
hmc5883l_simple:44: error: expected `;' before 'norm'
hmc5883l_simple:47: error: 'norm' not declared in scope

do guys know whats problem?

how many tabs have got in ide when compiling program ?

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