OpenWebMail Error (ow-shared.pl:1243 rev 671)

Session ID does not exist:
info@sapa-praha.cz*mail.sapa-praha.cz-session-0.859344051060365
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Software error:

Use of uninitialized value $homedir in concatenation (.) or string at /DISK5/WWW/shares/ow-shared.pl line 2284.

For help, please send mail to the webmaster (pipni@pipni.cz), giving this error message and the time and date of the error.