mbp 2016

hi, for a few days when i turn on the macbook i see this warning as soon as i try to login.

help me please

https://preview.redd.it/1koxh848j1sc1.jpg?width=4032&format=pjpg&auto=webp&s=e1dfc29cbc914c5e5a88b778115ffc45061979cf