[imp] Database problem while login?

[Thomas Booms]

Hello,

I get the following error message when I try to login to my webmailer.

How can I solve it? Did some database structures changed since the last 
version of IMP or another module?

Please help.

Thanks in advance,

Thomas

    *Ein schwerer Fehler ist aufgetreten:*

DB Error: already exists

[Zeile 297 von weboffice/test/horde/lib/Prefs/sql.php]

Details wurden für den Administrator mitgeloggt.
----

Here my configuration from test.php:

Horde Versions

    * Horde: 2.1
    * IMP: 3.1 (run IMP tests
      <http://weboffice.booms-edv.de/test/horde/imp/test.php>)
    * Turba: 1.1
    * Kronolith: 1.0
    * Nag: 1.0
    * Mnemo: 1.0


  PHP Version

    * View phpinfo() screen
      <http://weboffice.booms-edv.de/test/horde/test.php?mode=phpinfo>
    * PHP Version: 4.2.0
    * PHP Major Version: 4.2
    * PHP Minor Version: 0
    * PHP Version Classification: release
    * You are running a supported version of PHP.


  PHP Module Capabilities

    * FTP Support: *Yes*
    * Gettext Support: *Yes*
    * IMAP Support: *Yes*
    * LDAP Support: *Yes*
    * MCAL Support: *Yes*
    * Mcrypt Support: *Yes*
    * MySQL Support: *Yes*
    * PostgreSQL Support: *No*
    * XML Support: *Yes*


  Miscellaneous PHP Settings

    * short_open_tag enabled: *Yes*
    * magic_quotes_runtime set to Off: *Yes*
    * file_uploads enabled: *Yes*


  PHP Sessions

    * Session counter: 1
    * To unregister the session: click here
      <http://weboffice.booms-edv.de/test/horde/test.php?mode=unregister>


  PEAR

    * PEAR - *Yes*
    * Recent PEAR - *Yes*
    * Mail::RFC822 - *Yes*
    * Log - *Yes*
    * DB - *Yes*