MRTK Oculus opening file error

Hi guys, i'm a beginner with unity. I'm making a VR project using Microsoft MRTK for Oculus Quest. Everytime I open the project, I save it, I build it etc etc the message below appears to me. It's very boring and I didn't found anything on the Internet. Sorry for my English. Thanks. ![alt text][1] [1]: /storage/temp/184005-cattura.png