Error (10278):Verilog HDL Port Declaration error at led_display.v(9):

题目

Error (10278):Verilog HDL Port Declaration error at led_display.v(9):
input port "data_in" cannot be declared with type ""

答案

是不是定义了input data_in 又定义了reg data_in?
去掉reg data_in那行代码