What is wrong? Error while opening FPS Sample Project

![alt text][1] [1]: /storage/temp/157827-unbenannt.png I cloned the FPS Sample Project of Unity yesterday from github. https://github.com/Unity-Technologies/FPSSample But if I open it with the required version of Unity (2018.3.8f1) I get this huge errormessage. What is wrong? What i have to do? Thanks for your help.