Please help me with this FET message

[xing]

When it failed to generate timetables, we always get this message, as the attached figure.
But which activity should I pay attention to? The first single one, ID: 468 in the figure, or the last one in the given list below?
I am a little bit confused about the difference between these two possiblely problematic activities.

Great thanks for any help!

[Volker Dirr]

Sadly i can't see the whole list in your screenshot.
Can you please have a look if the last activity in that list is also id 468 ?
If it is also id 468, then you must of course check id 468.
If it is an other id, please attach you fet file here in the forum or sent it by email to me or to Liviu.

[xing]

Sorry about that. It is just because the list is too long to get all the messages in one screenshot.
But the last one in the list is not 468, and generally, it is different from the single one given in the above.
My problem is I am not so clear about this tip. Does it mean that the last one in the list is not arranged a time and room and it is maybe problematic? When it is different from the one given in the above, which one should be more carefully treated? And from a very general point of view, when it fails to get a timetable, which type of activities should be paied more attention and be modefied, the placed ones or the unplaced ones?

[Volker Dirr]

I will check you file later. I don't have time for that now. Maybe an other guy can help you faster.

About your last question:
That is up to you. FET will never be able to answer that. Simple example: You have got 31 activities that must be placed in room A but there are only 30 slots free. So FET will place 30 activities and then complain that it can't place the last activity. Now you have got at least 31 possibile variants to fix the problem. You could remove one out of the 30 placed activities into an other room or you could place the unplaced activity into an other room. FET can't answer that for you. You must decide it, depending on your data set.

[xing]

Thank you Volker for your replay.