Task inside Interface

interface simple_bus (input logic clk); // Define the interface
  logic req, gnt;
  logic [7:0] addr, data;
  logic [1:0] mode;
  logic start, rdy;

modport slave(input req, addr, mode, start, clk,
               output gnt, rdy,
               ref data,
               import slaveRead,slaveWrite);
             
//import into module that uses the modport
modport master(input gnt, rdy, clk,
               output req, addr, mode, start,
               ref data,
               import masterRead,masterWrite);
             
//import into module that uses the modport
task masterRead(input logic[7:0] raddr=8'h0); // masterRead method
  $display("Inside Master_Read");
endtask
             
task slaveRead;
  $display("Inside Slave_Read");
endtask
           
task masterWrite(input logic [7:0] waddr=8'h0);
  $display("Inside Master_Write");
endtask
             
task slaveWrite;
  $display("Inside Slave_Write");
endtask
             
endinterface: simple_bus
             
             
module mod (interface i)               ;
  always@(posedge i.clk) begin
     i.slaveRead;
     i.masterRead;
     i.slaveWrite;
     i.masterWrite;
   end              
endmodule
               
module top;
  logic clk = 0;
   simple_bus sb_intf(clk); // Instantiate the interface
   mod m (sb_intf.master) ;

   always #5 clk=!clk;
                 
   initial begin
      #50 $finish;                  
   end                                  

endmodule