Factory registration error

[geeta-yadav]

I tried compiling and running the test below:

import esdl;
import uvm;
import std.stdio;
class test_root: uvm_root
{
mixin uvm_component_utils;
}
class TestBench: RootEntity
{
uvm_root_entity!(test_root) tb;
}
class test1: uvm_test
{
mixin uvm_component_utils;
this(string name, uvm_component parent = null){
super(name, parent);
}
override void report() {
writeln("** UVM TEST PASSED **\n");
}
}
void main(string[] argv) {
TestBench tb = new TestBench;
tb.multiCore(2, 0);
tb.elaborate("tb", argv);
tb.simulate();
}

Here is the error which i get:

Starting Phase: CONFIGURE
********** No default timePrecision specified; setting timePrecision to 1.psec
********** No default timeUnit specified; setting timeUnit to 1.nsec
Starting Phase: BIND
Start of Simulation
UVM_WARNING @ #0: reporter [BDTYP] Cannot create a component of type 'test1.test1' because it is not registered with the factory.
UVM_WARNING @ #0: reporter [BDTYP] Object.factory Cannot create an object of type 'test1.test1'.
UVM_WARNING @ #0: reporter [BDTYP] Object.factory created an object but could cast it to uvm_component type 'test1.test1'.
UVM_FATAL @ #0: reporter [INVTST] Requested test from command line +UVM_TESTNAME=test1.test1 not found.

--- UVM Report Summary ---

** Report counts by severity
UVM_FATAL : 1
UVM_WARNING : 3
** Report counts by id
[INVTST] 1
[BDTYP] 3
Segmentation fault (core dumped)

Though i have used "mixin_component_utils" for the factory registration, it gives me the error stating that component is not registered with the factory. Why???

Thanks
Geeta