No scheduled scan

[mneg02]

I have a problem with scanning. If I scan now then it works just fine, but I can´t make my schedules work, and they have not been changed since it was working. What can be the problem? This is an abstrakt from our TscMGrevent-log:

Application Object Info at 2008-10-21 10:32:29 on INV01 by INV01
Object Deleted
[2.4.100] The object was deleted by another user or process.

Class:"Process Host Info"

Name:"Manager {50E62131-0EB2-11D3-AEF3-006008142EBC}"

Database Persistence Layer Info in CDBPersister::Retrieve at 2008-10-21 10:32:29
Object Deleted
[2.5.9] was deleted by another user.
</EVENT>

<EVENT AT="2008-10-21 10:35:59" SEVERITY="Info">
Application Object Info at 2008-10-21 10:35:59 on INV01 by INV01
Object Deleted
[2.4.100] The object was deleted by another user or process.

Class:"Process Host Info"

Name:"Manager {50E62131-0EB2-11D3-AEF3-006008142EBC}"

Database Persistence Layer Info in CDBPersister::Retrieve at 2008-10-21 10:35:59
Object Deleted
[2.5.9] was deleted by another user.
</EVENT>

Could this be the problem? How can I solve the problem? I have made some user defined fields, could they disturb?