在编写led程序，编译时出现错误
// ********************************************************************
// >>>>>>>>>>>>>>>>>>>>>>>>> COPYRIGHT NOTICE <<<<<<<<<<<<<<<<<<<<<<<<<
// ********************************************************************
// File name : LED.v
// Module name : LED
// Author : STEP
// Description : control LED
// Web : www.stepfpga.com
//
// --------------------------------------------------------------------
// Code Revision History :
// --------------------------------------------------------------------
// Version: |Mod. Date: |Changes Made:
// V1.0 |2017/03/02 |Initial ver
// --------------------------------------------------------------------
// Module Function:利用按键和开关的状态来控制LED灯的亮灭。
module LED (key,sw,led);
input [3:0] key; //按键输入信号
input [3:0] sw; //开关输入信号
output [7:0] led; //输出信号到LED
assign led = {key,sw}; //assign连续赋值。大括号是拼接符，表示把key和sw拼接组成一个新的8位数赋值给led
endmodule
代码从网站上粘贴的，然后在编译时出现了错误：
Error (215039): Power Analyzer (quartus_pow) cannot be run. It requires a successful run of the Assembler. The Assembler (quartus_asm) failed or was not run.
Error: Quartus Prime Power Analyzer was unsuccessful. 1 error, 1 warning
Error: Peak virtual memory: 4661 megabytes
Error: Processing ended: Wed Sep 16 16:37:42 2020
Error: Elapsed time: 00:00:03
Error: Total CPU time (on all processors): 00:00:00
想知道怎样可以解决这个wen'ti
