Arduino and QTR-8A library problem

Hello evryone I try to make My own line following robot but when I try to use arduino QTR library I get this error.Can someone help me how to fix set the library correctly.


It looks like you have not actually installed the QTR library. You can find instructions on how to install it in the Arduino Library for the Pololu QTR Reflectance Sensors which can be found under the “Resources” tab on the QTR Sensor’s product page.