SQL 2005 Job Is Failing

SQL Server 2005 version: 2153
I created a maintplan for system and user databases includes rebuild index, maint cleanup tasks.

Job is failing for user databases
It includes rebuild index task( online index enabled) and maintenance cleanup task, scheduled at every sunday 1 AM.


I receive following errors:

In eventvwr log

sql server scheduled job 'DBMP_RebuildIndex_User'
status: failed-Invoked on 2007-12-02 -1:00 Message: The job failed. The job was invoked by schedule 8 ('DBMP_RebuildIndex_User-Schedule).The last step to run was step1 ('DBMP_RebuildIndex_User')[/red]

In log report:

Failed-1073548784) Excuting the query "ALTER INDEX [XPKact_log] ON
[dbo].[act log] REBUILD WITH (PAD_INDEX=OFF,
STATISTICS_NORECOMPUTE=OFF,ALLOW_ROW_LOCKS=ON,ALLOW_PAGE_LOCKS=ON,SORT_IN_TEMPDB=OFF,ONLINE=ON)
"failed with the following error "Online index operation cannot be performed for index 'XPKact_log' because the index contains column 'action_desc' of data type text, ntext.image.varchar(max),varbinary(max) or xml. For non clusterd index the column could be an include column of the index. for clusterd index it could be any column of the table .Incase of drop_existing the cloumn could be part of new or old index. The operation must be performed offline". Possible failure reasons : Problems with the querey .'" Resultset" property not set correctly, parameters not set correctly, or connection not established correctly.

Please anyone help me on this?
I really appriciate

Thnks