trying to upload code with no luck

I had been reading on using Arduino to make a load cell to test braking load of balsa bridges. now my problem is when I try to upload to my uno board I get this error. I have also included the code I'm trying to use. any help would be appreciated.

Arduino: 1.6.12 (Windows 10), Board: "Arduino/Genuino Uno"

C:\Users\semlo\AppData\Local\Temp\arduino_modified_sketch_436922\sketch_dec12b.ino:36:19: fatal error: HX711.h: No such file or directory

#include "HX711.h"

^

compilation terminated.

exit status 1
Error compiling for board Arduino/Genuino Uno.
Invalid library found in C:\Users\semlo\OneDrive\Documents\Arduino\libraries\readme_hx711: C:\Users\semlo\OneDrive\Documents\Arduino\libraries\readme_hx711
Invalid library found in C:\Users\semlo\OneDrive\Documents\Arduino\libraries\readme_hx711: C:\Users\semlo\OneDrive\Documents\Arduino\libraries\readme_hx711

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

this is the code

#include "HX711.h"

HX711 scale;

void setup() {
Serial.begin(38400);
Serial.println("HX711 Demo");

Serial.println("Initializing the scale");
// parameter "gain" is ommited; the default value 128 is used by the library
// HX711.DOUT - pin #A1
// HX711.PD_SCK - pin #A0
scale.begin(A1, A0);

Serial.println("Before setting up the scale:");
Serial.print("read: \t\t");
Serial.println(scale.read()); // print a raw reading from the ADC

Serial.print("read average: \t\t");
Serial.println(scale.read_average(20)); // print the average of 20 readings from the ADC

Serial.print("get value: \t\t");
Serial.println(scale.get_value(5)); // print the average of 5 readings from the ADC minus the tare weight (not set yet)

Serial.print("get units: \t\t");
Serial.println(scale.get_units(5), 1); // print the average of 5 readings from the ADC minus tare weight (not set) divided
// by the SCALE parameter (not set yet)

scale.set_scale(2280.f); // this value is obtained by calibrating the scale with known weights; see the README for details
scale.tare(); // reset the scale to 0

Serial.println("After setting up the scale:");

Serial.print("read: \t\t");
Serial.println(scale.read()); // print a raw reading from the ADC

Serial.print("read average: \t\t");
Serial.println(scale.read_average(20)); // print the average of 20 readings from the ADC

Serial.print("get value: \t\t");
Serial.println(scale.get_value(5)); // print the average of 5 readings from the ADC minus the tare weight, set with tare()

Serial.print("get units: \t\t");
Serial.println(scale.get_units(5), 1); // print the average of 5 readings from the ADC minus tare weight, divided
// by the SCALE parameter set with set_scale

Serial.println("Readings:");
}

void loop() {
Serial.print("one reading:\t");
Serial.print(scale.get_units(), 1);
Serial.print("\t| average:\t");
Serial.println(scale.get_units(10), 1);

scale.power_down(); // put the ADC in sleep mode
delay(5000);
scale.power_up();
}

You need to install the HX711 library:

thanks that was it