My verilog code:

export "DPI-C" function inst_fetch;


module mymodule;

//other code...

function [31:0] inst_fetch;
    return inst;
endfunction

//other code...

endmodule

And I verilated it. However, verilator reports an error:
"Can't find definition of exported task/function: 'inst_fetch'"

Are there some syntax errors?

I read the section about dpi-c in the Verilator manual but didn’t find the solution.