[imp] Sarange error...

[Paolo Cavicchini]

Hello,
I have just installed Horde with IMP on a Linux RH 7.3

When I try to open:

http://hostname/horde/imp/login.php

the server show me:

"Notice: Use of undefined constant SORTARRIVAL - assumed 'SORTARRIVAL' in
/opt/apache/htdocs/horde/imp/config/prefs.php on line 502

Notice: Use of undefined constant SORTARRIVAL - assumed 'SORTARRIVAL' in
/opt/apache/htdocs/horde/imp/config/prefs.php on line 506

Notice: Use of undefined constant SORTDATE - assumed 'SORTDATE' in
/opt/apache/htdocs/horde/imp/config/prefs.php on line 507

Notice: Use of undefined constant SORTFROM - assumed 'SORTFROM' in
/opt/apache/htdocs/horde/imp/config/prefs.php on line 508

Notice: Use of undefined constant SORTSUBJECT - assumed 'SORTSUBJECT' in
/opt/apache/htdocs/horde/imp/config/prefs.php on line 509

Notice: Use of undefined constant SORTSIZE - assumed 'SORTSIZE' in
/opt/apache/htdocs/horde/imp/config/prefs.php on line 510
"

Please, has anyone any suggestion?

Thank you
Paolo