'timescale 10ns/1ps
module cnt_test();
reg[4:0]data;
reg rst,load,clk;
wire[4:0] dout;
'define period 10
cnt cl(.dout(dout),.clk(clk),.data(data),.rst(rst),.load(load));//counter(dout,clk,data,rst,load);
initial
  clk=0;
always
begin
  #5 clk=1'b1;
  #5 clk=1'b0;
end
initial
begin
  data=5'h15;
  load=0;
  rst=1;
  #'period rst=0;
  #('period*5) data=5'h1d;
  load=1;
  #'period load=0;
  #('period*50)
  $finish;
  end
  endmodule


编译显示错误：** Error: D:workspaceModelSimworkcnt_test.v(1): near "'t": Illegal base specifier in numeric constant.
** Error: D:workspaceModelSimworkcnt_test.v(1): near "'t": syntax error, unexpected BASE, expecting class

请问哪里错了，调用的函数编译没错。。。。