Ref Clock problem in the simple_socket_server exemple based on the Triple Speed Ethernet for Cyclone 10 GX Development kit through Quartus 18.1

Hello I get the following error when I try to compile with quartus 18.1 the simple_socket_server exemple given for the Cyclone 10 GX dev kit : "Error(18694): The reference clock on PLL "sss_qsys_i...