Error when importing GDS and CIF files using Cadence

cif to gds

Hello, hope somebody can help me with this

I export a layout to a cif file using Cadence / PIPO 5.0.0, when importing I get a few warnings and error:

*Warning* invalid cell view -- 167679020
*Warning* invalid cell view -- (unknown)
*Warning* dbGetCellViewDdId: Invalid cell ViewId 167679020
FATAL (101): Failed to create the instance `' of the master cel `pad_frame20'.

where pad_frame20 is the name of the top cell. I noticed that it imports everything except for the corresponding active in ptap and ntap. Any ideas???

Thanks

Added after 5 hours 38 minutes:

forgot to mention about the gds, when I export and import, I do a DRC check of the imported library and everything seems to be fine except for the following errors:

(SCMOS Rule 12.6) transistor electrode to active contact spacing: 0.90 um
(SCMOS Rule 6.2.b) active enclosure of contact: 0.30 um
(SCMOS Rule 6.6.b) active contact to field poly spacing: 0.60 um

again, the active does not seem to be there, and the m1_p1 contacts have errors. Any help would be greatly appreciated.

Thanks,