"Error (10500): VHDL syntax error at muxtwo.vhd(1) near text "reg"; expecting "entity", or "architecture", or "use", or "library", or "package", or "configuration"这是什么意思啊?"
"Error (10500): VHDL syntax error at muxtwo.vhd(1) near text "reg"; expecting "entity", or "architecture", or "use", or "library", or "package", or "configuration"出现这个原因是什么啊 ..."