The issue of Cubit generating. h5m files but unable to run them in OpenMC

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1

I am generating geometry similar to the dagmc example in Cubit and exporting a. h5m file, but it cannot run. The error is as follows:

Reading geometry XML file...
MOAB ERROR: --------------------- Error Message ------------------------------------
MOAB ERROR: Could not insert implicit complement into surface sense data!
MOAB ERROR: generate_implicit_complement() line 1717 in GeomTopoTool.cpp
MOAB ERROR: --------------------- Error Message ------------------------------------
MOAB ERROR: Could not create implicit complement!
MOAB ERROR: setup_implicit_complement() line 1651 in GeomTopoTool.cpp
Loading file whole.h5m
Initializing the GeomQueryTool...
Using faceting tolerance: 4.63784e-310
ERROR: Failed to find or create implicit complement handle.
MOAB ERROR: --------------------- Error Message ------------------------------------
MOAB ERROR: Failed to setup the implicit compliment!
MOAB ERROR: init_OBBTree() line 681 in DagMC.cpp
MOAB ERROR: init_dagmc() line 137 in dagmc.cpp
 ERROR: No cells were found in the geometry.xml file
application called MPI_Abort(comm=0x84000002, -1) - process 0
[unset]: write_line error; fd=-1 buf=:cmd=abort exitcode=-1
:
system msg for write_line failure : Bad file descriptor

I tried setting different blocks and groups for different materials, and assigned corresponding block IDs or group IDs. But in the process of Python, all IDs prompt “Another Material instance already exists with id=1”

Thank you in advance!