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Please import the mesh_intersections.nas in HyperMesh. This will give you an idea of where the problem region is this. As the name tells, there are intersecting elements in this region.
Are you exporting using CFD (AcuSolve) profile and the format Natran Fluent ?
Can you post a screenshot of the folder where the .ACS file is ? Is there a meshintersections.dat file?