The object at dereference depth 1 is being used before it was constructed/allocated

[chr_sue]

In reply to tinku_mistry:

line 23 in AHB_agent.sv is
if(m_cfg.is_active == UVM_ACTIVE)
m_cfg is of type ahb_agent_config and this config does not have a data member called is_active.
is_active is defined in your class ahb_agent_config.