Virtual method 'write' not implemented in class

UVM
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1

Hello, I am getting the above error for my uvm_subscriber class that I wrote as following.


`uvm_analysis_imp_decl(_bfm2dut_change)

class checker_subscriber extends uvm_subscriber; 
   
    uvm_analysis_imp_bfm2dut_change#(setup_pcie_pkg::dut2bfm_hdr_trans, checker_subscriber) bfm2dut_change_ap;

`uvm_component_utils(checker_subscriber)

     extern function new(string name = "checker_subscriber", uvm_component parent = null);
     extern virtual function void build_phase(uvm_phase phase);
     extern virtual function void connect_phase(uvm_phase phase);
     extern virtual task run_phase(uvm_phase phase);

    // write function xal2fb
    virtual function void write_xal2fb_change(xal2fb_uvc::transaction tr);
        xal2fb_uvc::tx_default_data_obj obj;
        $cast(obj, tr.tx_data_obj);
        `uvm_info("xal2fb  PPMSU monitoring", $sformatf("%m"), UVM_LOW)
        monitor_xal2fb_pcie_order_check(obj);
    endfunction: write_xal2fb_change
   
endclass : checker_subscriber
2

Should the function name be write instead of write_xal2fb_change?