Libphy: PHY 4a101000.mdio: 01 not found in Beagleboneblack

Question

I connect the LCD screen lid to the beagleboneblack, it works fine, but suddenly I start to have this message

[34.197758] libphy: PHY 4a101000.mdio:01 not found                           
[34.203275] net eth0: phy 4a101000.mdio:01 not found on slave 1

and he is not logged in to the desktop. How can i fix it