Simulate Error in Modelsim

It looks like that you only have your module name in line 5 of your testbench, you need to add an instance name (e.g. U1) after the module name, that looks like below.

count16 U1 ( .count(cnt_out),...);

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Hi all,

I got an error when simulating these files:

Example.v

module MyAdd(Co,Ci1,Ci2);
  input Ci1,Ci2;
  output Co;
  assign C0=Ci1&Ci2;
endmodule

Testbench_MyAdd.v

module Testbench_MyAdd();
    reg A, B;
  wire Y;
  parameter time_out = 200;
  MyAdd(Y, A, B);
  initial $monitor("A=%b, B=%b, C=%b", A, B, Y);
  initial# time_out $finish;
  initial begin
   # 30 A = 0; B = 0;
   # 30 A = 0; B = 1;
   # 30 A = 1; B = 0;
   # 30 A = 1; B = 1;
  end
endmodule

and the error is:

# ** Error: (vsim-3037) D:/altera/10.1/Projects/ModelSim/Testbench_MyAdd.v(5): Missing instance name in instantiation of 'MyAdd'.#          Region: /Testbench_MyAdd

Anyone can help me resolve this issue?

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I instance

MyAdd MA1 (Y, A, B);

and It worked:D