Cannot open dump file vtk error

Hi,

I am running screw-conveyor LIGGGHTS simulations on our University cluster and everything was fine the first week. But now I am running into this error (shown below and attached). The log file has no errors and the same input file runs fine in another Linux system. Can anyone help me figure out what the issue is? Thank you in Advance.

ERROR: In /build/vtk6-9ueea8/vtk6-6.3.0+dfsg2/IO/Legacy/vtkDataWriter.cxx, line 163
vtkRectilinearGridWriter (0x555bb7c3b9a0): Unable to open file: post/pellets_boundingBox_295000.vtk

WARNING: time-step is 75.396537 % of rayleigh time (../fix_check_timestep_gran.cpp:200)
WARNING: time-step is 15.453120 % of hertz time (../fix_check_timestep_gran.cpp:208)
ERROR: In /build/vtk6-9ueea8/vtk6-6.3.0+dfsg2/IO/Legacy/vtkDataWriter.cxx, line 163
vtkPolyDataWriter (0x555bb7c3b9a0): Unable to open file: post/pellets_300000.vtk

ERROR: In /build/vtk6-9ueea8/vtk6-6.3.0+dfsg2/IO/Legacy/vtkDataWriter.cxx, line 163
vtkRectilinearGridWriter (0x555bb7c3b9a0): Unable to open file: post/pellets_boundingBox_300000.vtk

ERROR on proc 0: Cannot open dump file (../dump.cpp:472)