Dagmc unstructured grids

Hi, I have a question about unstructured grids. My computer configuration and plugin (dagmc cubit) have been installed. Can be done the case “https://nbviewer.org/github/openmc-dev/openmc-notebooks/blob/main/unstructured-mesh-part-i.ipynb”, However, for my simple geometry, I built the mesh in cubit, export dagmc “test.h5m” and took .h5m file as umesh. The whole process can be calculated, but the tallies.out file is empty and cannot identify and loading my mesh file .This question diffuse me.
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i have already solve the question,thanks