Reason: due to not setting the proteus power supply
Solution: Select the power supply in Design->Configure Power Rails... and it will not be connected to the grid
Just add to the network connection.
step1:点击工具栏上方的 Design 选项
step2:点击 “Configure Power Rails"
step3:添加电源连接
step4:勾选左下角的 "Use default power rail connections?"
step5:点击 OK