Error: (vlog-13069) E:/Questasim/examples/180121/uvm_write_txn.sv(9): near "uvm_sequence_item": syntax error, unexpected IDENTIFIER. ** Error: E:/Questasim/examples/180121/uvm_write_txn.sv(9): Error in class extension specification

In reply to vijaykumarvec:

You should only compile files 2 & 4.