Project Server 2007: Set progress Error

[Pavel Shilov]

When I try to set progress for task assigned to me:

Type 'Microsoft.Office.Project.Scheduling.DayOfMonthException' in Assembly
'Microsoft.Office.Project.WebProj, Version=12.0.0.0, Culture=neutral,
PublicKeyToken=71e9bce111e9429c' is not marked as serializable.

Details:

Task Name Start Finish Progress Resource Name
Task1 6/29/2006 6/29/2006 Error Pavel Shilov

On pop-up:
6/26/2006 > 7/3/2006
Mon Mon 26 Tue 27 Wed 28 Thu 29 Fri 30 Sat 01
Sun 02
Planned 0h 0h 0h 8h 0h
0h 0h
Work 0h 0h 0h 0h 0h
0h 0h
Overtime 0h 0h 0h 0h 0h
0h 0h


Settings:

Server Settings->Task Settings and Display:
Tracking Method - Hours of work done per day

Any idea?