[phenixbb] problem converting PDB file to mmcif for deposition

Hi Everybody, I encountered a problem recently in converting my PDB file to mmcif using the pdb_extract tool in rcsb. It simply writes out an empty file!! I wonder if any of you have faced such a problem before and know the solution!! I carefully examined the PDB file header and I couldn't really find a reason why this PDB failed to be converted. I only use PHENIX for molecular replacement and refinement. I used the default TLS refinement so I assume the whole structure will be refined as a group. I hope somebody is familiar with this can help me out. Thank you very much, Mohd