Parametrize the Communication with No_Comm
The Dune::Communication should be parametrized with a "Communicator", typically either MPI_Comm or Dune::No_Comm. Since FoamGrid is not parallel, the correct type should be No_Comm.
The Dune::Communication should be parametrized with a "Communicator", typically either MPI_Comm or Dune::No_Comm. Since FoamGrid is not parallel, the correct type should be No_Comm.