In reply to chr_sue:
I already tried applying reset to the model in reset phase of my test but it did not work. I think the default uvm_reg_hw_reset_seq does that implicitly but I did try doing the following in my test but I still see the same error.
task reset_phase(uvm_phase phase);
xxx_env.m_ral_env.m_ral_model.reset();
endtask : reset_phase
Is there anything else I can try to debug this issue ?