Help needed - RIPE database server

Hi,
 we have installed and configured a RIPE Database server for private use. We have added mntner and person objects in the database by
email and it succeeded.
When we try to add new inetnum objects the creation failed even if the syntax check is passed.
The report is:
---------------------------------------------------------------------
SUMMARY OF UPDATE:

Number of objects found:                   1
Number of objects processed successfully:  0
  Create:         0
  Modify:         0
  Delete:         0
  No Operation:   0
Number of objects processed with errors:   1
  Create:         0
  Modify:         0
  Delete:         0
  Syntax Errors:  1


DETAILED EXPLANATION:


***Warning: Invalid keyword(s) found: inetnum
***Warning: All keywords were ignored

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The following object(s) were found to have ERRORS:


---
Update FAILED: [inetnum] 193.42.141.0 - 193.42.141.255
***Error: Syntax error in object

inetnum:  193.42.141.0 - 193.42.141.255
netname:  SPC-NETWORK
descr:  Sistema Pubblico di Connettivit.
country:  IT
admin-c:  GF1-SPC
tech-c:  RR1-SPC
status:  ASSIGNED PA
mnt-by:  SPC-DBM-MNT
changed:  roberto.recchia at PU......WL(csp.it
***Error: Syntax error in "roberto.recchia at PU......WL(csp.it"
source:  SPC

-----------------------------------------------------------

Could you help me please?
Best regards,
Valentina Bruno