How come I don't get more to go on as an error message.

Have a time dimension from Accelerator with a normal time dimension and then
a virtual time dimension with a week hierachy.

When looking at the week hierachy dimension in dimension browser it looks
fine but when processing it in a cube it says:

06-06-2005 22:59:09 11680 Initiating transaction in Database 'UM_DW_Finance'
06-06-2005 22:59:09 11680 Processing Cube 'test dato' Start time:
22:59:09
06-06-2005 22:59:09 11680 Initializing Cube 'test dato'
06-06-2005 22:59:10 11680 Processing Partition 'test dato' Start
time: 22:59:10
06-06-2005 22:59:10 11680 Initializing Partition 'test dato'
06-06-2005 22:59:10 11680 Partition 'test dato' Execute : SELECT
"dbo"."Dim_Time_Day"."Day_Idx", "dbo"."datotest"."test" FROM
"dbo"."datotest", "dbo"."Dim_Time_Day" WHERE
("dbo"."Dim_Time_Day"."Day_Idx"="dbo"."datotest"." dato")
06-06-2005 22:59:10 11680 Analysis Server Error: Internal error
[Object does not exist] '04-01-1998' ; Time:06-06-2005 22:59:10
06-06-2005 22:59:10 11680 Analysis Server Error: Internal error
[Object does not exist] '04-01-1998' ; Time:06-06-2005 22:59:10
06-06-2005 22:59:10 11680 Processing Partition 'test dato' failed.
No changes have been made to the database.
06-06-2005 22:59:10 11680 Processing Cube 'test dato' failed. No changes
have been made to the database.
06-06-2005 22:59:10 11680 Rolling back transaction in Database
'UM_DW_Finance'

Then tried to make a new physical dimension with the same levels wich seams
to work...don't understand why the virtual didn't - it worked in
accelerator...and I don't know where to look based on the above...