Need guidance for basic DPI example

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====================================
=========SV FILE top.sv ==============
module top;
import "DPI-C" string_sv2c=function void string_sv2c();
 
initial
begin
string_sv2c();
end
 
endmodule
 
 
===================================
===================================
 
 
===================================
======== C FILE main.c ==============
 
#include "stdio.h"
#include "dpi_header.h"
#include "svdpi.h"
 
void string_sv2c(){
printf(" C: Hellow from C ");
}

Code dot - [expand]
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vlib work
vlog -dpi_header dpi_header.h top.sv main.c
vism -c work.main -do "run -all"

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Reading pref.tcl
 
# 10.2c
 
 
# vsim -do {run -all} -c work.main
 
# ** Note: (vsim-3812) Design is being optimized...
 
# ** Error: Failed to find design unit work.main.
 
# Optimization failed
 
# Error loading design
 
Error loading design