Anoying Warnings and it doesn't Work

[Alexandre Mendes]

Warning: Use of undefined constant OP_HALFOPEN - assumed 'OP_HALFOPEN' in
/var/www/html/horde/imp/lib/IMP.php on line 169

Warning: Use of undefined constant OP_ANONYMOUS - assumed 'OP_ANONYMOUS' in
/var/www/html/horde/imp/lib/IMP.php on line 295

Warning: Use of undefined constant OP_HALFOPEN - assumed 'OP_HALFOPEN' in
/var/www/html/horde/imp/lib/IMP.php on line 296



Warning: Use of undefined constant SORTARRIVAL - assumed 'SORTARRIVAL' in
/var/www/html/horde/imp/config/prefs.php on line 233

Warning: Use of undefined constant SORTARRIVAL - assumed 'SORTARRIVAL' in
/var/www/html/horde/imp/config/prefs.php on line 237

Warning: Use of undefined constant SORTDATE - assumed 'SORTDATE' in
/var/www/html/horde/imp/config/prefs.php on line 238

Warning: Use of undefined constant SORTFROM - assumed 'SORTFROM' in
/var/www/html/horde/imp/config/prefs.php on line 239

Warning: Use of undefined constant SORTSUBJECT - assumed 'SORTSUBJECT' in
/var/www/html/horde/imp/config/prefs.php on line 240

Warning: Use of undefined constant SORTSIZE - assumed 'SORTSIZE' in
/var/www/html/horde/imp/config/prefs.php on line 241

Please If someone can help me   thanks. 
Mr MENDES Alexandre 
I.U.T. de Clermont - Fd
Département Informatique 
B.P. 86 
63172 AUBIERE Cedex
04.73.17.71.10
Alexandre.Mendes@iut.u-clermont1.fr