Anyone got ideas where I start to lokk to resolve the following problem ?

It looks like once a week the system I know look after runs a scheduled
part of the maintanence plan under schedule 2.

to check the data and the index linkage. the error I get is

Microsoft ODBC SQL Server Driver SQL Server Server Repair
Statement not processed Database needs to be in single user mode

I have made no changes to SQL in any form prior to this error.