diff --git a/modules/io/src/mol/mmcif_writer.cc b/modules/io/src/mol/mmcif_writer.cc index 785c3aabe8862b9dc27eda3882d0bc740944a794..d682b13ff7fa5954cba79e3d0aef5562e6edecd5 100644 --- a/modules/io/src/mol/mmcif_writer.cc +++ b/modules/io/src/mol/mmcif_writer.cc @@ -1263,8 +1263,11 @@ namespace { Feed_atom_site(atom_site, chain_name, entity_id, entity_info[entity_id], tmp); } else { - // TODO: make error message more insightful... - throw ost::io::IOException("Unsupported chem class..."); + // this should not happen... + std::stringstream ss; + ss << "Unsupported chem class (" << res.GetChemClass(); + ss << ") for residue "<< res; + throw ost::io::IOException(ss.str()); } }