problem with core tone library

I am trying to generate a series of frequencies using the tone library, but I keep getting an error message

core.a(Tone.cpp.o): In function `disableTimer(unsigned char)':
C:\arduino22\arduino-0022\hardware\arduino\cores\arduino/Tone.cpp:415: multiple definition of `timer1_toggle_count'
Tone\Tone.cpp.o:C:\arduino22\arduino-0022\libraries\Tone/Tone.cpp:102: first defined here

even if I just try to generate a single tone.

 #include <Tone.h>
int drivePin = 8;
void setup () {
    pinMode (drivePin,OUTPUT );
  Serial.begin (9600);
  }
 void loop () {
tone(drivePin, 1000, 250);
}

Any ideas? I am not using any delays ?

Remove this line…

#include <Tone.h>

Of course ! its in the core now ........

Thanks