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Illegal assignment to class type from class type

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I am trying to build a dummmy uvm verification environment. The sequencer and driver work correctly but as soon as I add a monitor in the agent, I get the error - "Illegal assignment to class type monitor_base from class type sequencer_base". This error is produced at "mon = monitor_base::type_id::create("monitor",this);" in the build_phase function of the agent. This is a strange error as sequencer has nothing to assign to monitor. The code is given below for further reference. I am using Questa Sim 10.0d.

class agent_base extends uvm_agent;


// Component Members

sequencer_base seq;

driver_base driver;

monitor_base mon;

function new(string name = "agent_base", uvm_component parent = null);



function void build_phase(uvm_phase phase);

seq = sequencer_base::type_id::create("sequencer",this);

driver = driver_base::type_id::create("driver",this);

mon = monitor_base::type_id::create("monitor",this); // ERROR !


function void connect_phase(uvm_phase phase);


endfunction : connect_phase

endclass: agent_base

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