ATTINY85 20PU Arduino Error

i've tried that and now i get this error, Sorry i'me a newb, and very greatful for the help from everyone, this is the error below with sketch
the 8bit servo file that i download is in arduino-0022/libraries/servo
with the download there is these files
example.cpp
Makefile
Readme
Servo8Bit.cpp
Servo8Bit.cpp
an i have closed the program and unhooked the board and reconnected it and opend arduino and opened file/examples/servo/knob.
i noticed that when i add 8bit to Servo myservo; the Servo thats in orange changed to black when i add 8bit

here is the sketch that i used

// Controlling a servo position using a potentiometer (variable resistor)
// by Michal Rinott http://people.interaction-ivrea.it/m.rinott

#include <Servo8bit.h>

Servo8bit myservo; // create servo object to control a servo

int potpin = 2; // analog pin 2 used to connect the potentiometer
int val; // variable to read the value from the analog pin

void setup()
{
myservo.attach(0); // attaches the servo on pin 0 to the servo object
}

void loop()
{
val = analogRead(potpin); // reads the value of the potentiometer (value between 0 and 1023)
val = map(val, 0, 1023, 0, 179); // scale it to use it with the servo (value between 0 and 180)
myservo.write(val); // sets the servo position according to the scaled value
delay(15); // waits for the servo to get there
}

error that i get

Knob.cpp:4:24: error: Servo8bit.h: No such file or directory
Knob:5: error: 'Servo8bit' does not name a type
Knob.cpp: In function 'void setup()':
Knob:12: error: 'myservo' was not declared in this scope
Knob.cpp: In function 'void loop()':
Knob:19: error: 'myservo' was not declared in this scope