Using CoupledVarThresholdElementSubdomainModifier

[rnpratoori]

Hello,

I have a square mesh using GeneratedMesh. In that I have an initial condition using LatticeSmoothCircleIC. I want to identify the generated circles with a different subdomain id. Since I know the values of the variable in that region, I used CoupledVarThresholdElementSubdomainModifier. This give me the following error -

*** ERROR ***
/home/rnp/MOOSE/projects/panther/problems/2p_void.i:23.1:
The following error occurred in the MooseMesh 'mesh' of type GeneratedMesh.

Requested subdomain 2 does not exist.

This is the code snippet -

[Mesh]
    # generate a 2D mesh
    type = GeneratedMesh
    dim = 2
    nx = ${n}
    ny = ${n}
    xmax = ${d}
    ymax = ${d}
[]

[MeshModifiers]
    [void]
      type = CoupledVarThresholdElementSubdomainModifier
      coupled_var = c3
      criterion_type = ABOVE
      subdomain_id = 2
      threshold = 1e-6
    []
[]

How can I correct it?

[vanwdani]

Add subdomain_ids = 2 to the GeneratedMeshGenerator

[Traiwit]

try add_subdomain_ids = '0 1 2' under [Mesh]