我的仿真在运行的时候总是提示
ERROR -- Node GND_SIGNAL is floating
ERROR -- Node N00308 is floating
ERROR -- Node N01613 is floating
ERROR -- Node GND_EARTH is floating
ERROR -- Node N01690 is floating
ERROR -- Node N01529 is floating
ERROR -- Node N01558 is floating
ERROR -- Node N01593 is floating
请问是什么原因，怎么改正
