Error with oneway coupling

Hi All,

I have used "twoWayMPI" as a data exchange model, and now I try to use "oneWayVTK" model. So I changed the 'couplingProperties' file as follows:

//for twoWayMPI//

dataExchangeModel twoWayMPI;

twoWayMPIProps
{
maxNumberOfParticles 10100;
liggghtsPath "../DEM/in.liggghts_bonded";
}

//change these for oneWayVTK//

dataExchangeModel oneWayVTK;

oneWayVTKProps
{
DEMts 0.001;
relativePath "../DEM/post";
couplingFilename "pre%4.4d.vtk";
maxNumberOfParticles 30000;
}

It works until data saving time step; it means if I set the time interval for CFD calculation as 0.001 s and for CFD data saving as 0.01 s, the simulation ran well until 0.009 s but it had an error at t = 0.01s. Do I have to change other things besides changing the codes in couplingproperties? The error on terminal was as below:

Time = 0.01

Courant Number mean: 0.00448055 max: 0.180375

timeStepFraction() = 0.01
createTimeDir(path_), path="./lagrangian"
lagPath_=createTimeDir(fileName(lagPath_/lagrangian)), lagPath="./lagrangian"
[0] #0[1] #0 Foam::error::printStack(Foam::Ostream&)Foam::error::printStack(Foam::Ostream&) at ??:?
[1] #1 Foam::sigSegv::sigHandler(int) at ??:?
[0] #1 Foam::sigSegv::sigHandler(int) at ??:?
[0] #2 ? at ??:?
[1] #2 ? in "/lib/x86_64-linux-gnu/li in "/lib/x86_64-linux-bpthread.so.0"
gnu/libpthread.so.0"
[0] #3 Foam::basicIO::dumpDEMdata() const[1] #3 Foam::basicIO::dumpDEMdata() const at ??:?
[0] #4 Foam::cfdemCloud::evolve(Foam::GeometricField&, Foam::GeometricField, Foam::fvPatchField, Foam::volMesh>&, Foam::GeometricField, Foam::fvPatchField, Foam::volMesh>&) at ??:?
[1] #4 Foam::cfdemCloud::evolve(Foam::GeometricField&, Foam::GeometricField, Foam::fvPatchField, Foam::volMesh>&, Foam::GeometricField, Foam::fvPatchField, Foam::volMesh>&) at ??:?
[0] #5 at ??:?
[1] #5 ?? at ??:?
[0] #6 __libc_start_main at ??:?
[1] #6 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
[0] #7 in "/lib/x86_64-linux-gnu/libc.so.6"
[1] #7 ?? at ??:?
at ??:?