problem adding files to a branch

[Jean-Pierre Sevigny]

Hi,

We're having a problem adding files to a branch in our repository. We're 
using  cvs version 1.11.17, with both clients and server on linux.

This is the detail:

$ cvs add test.txt
cvs add: cannot add file on non-branch tag uwap_3_1-RELEASE

This is the status of one file in the directory (so you get some 
information - i've changed our repository location to an alias):
$cvs status formats.txt
===================================================================
File: formats.txt       Status: Up-to-date

  Working revision:    1.1
  Repository revision: 1.1     repository/formats.txt,v
  Sticky Tag:          uwap_3_1-RELEASE (branch: 1.1.6)
  Sticky Date:         (none)
  Sticky Options:      (none)

$cvs status -v formats.txt
===================================================================
File: formats.txt       Status: Up-to-date

  Working revision:    1.1
  Repository revision: 1.1     repository/formats.txt,v
  Sticky Tag:          uwap_3_1-RELEASE (branch: 1.1.6)
  Sticky Date:         (none)
  Sticky Options:      (none)

  Existing Tags:
       test_branch                     (branch: 1.1.8)
       uwap_3_1_1-RELEASE              (revision: 1.1)
       wap_3_1-RELEASE                 (revision: 1.1)
       uwap_3_1-RELEASE                (branch: 1.1.6)
       wap_3_0-RELEASE                 (branch: 1.1.4)
       wap_3_0_1-RELEASE               (revision: 1.1)
       uwap_3_0-RELEASE                (branch: 1.1.2)

----------
I checked all files, and I don't see any where the branch name is a tag 
(i.e. it doesn't seem to be the problem, as i've found when googling 
that error).

Any idea what's going on?
Regards,
Jean-Pierre Sevigny