sql server log scan number passed to log scan error

I'm getting the below message when trying to attach our database. Any ideas?

Thx bob


Attach database failed for Server 'SLIMLINE\SQLEXPRESS'.  (Microsoft.SqlServer.Express.Smo)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=9.00.3042.00&EvtSrc=Microsoft.SqlServer.Management.Smo.ExceptionTemplates.FailedOperationExceptionText&EvtID=Attach+database+Server&LinkId=20476

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ADDITIONAL INFORMATION:

An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.Express.ConnectionInfo)

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The log scan number (2404:47:1) passed to log scan in database 'IRI' is not valid. This error may indicate data corruption or that the log file (.ldf) does not match the data file (.mdf). If this error occurred during replication, re-create the publication. Otherwise, restore from backup if the problem results in a failure during startup.
Could not open new database 'IRI'. CREATE DATABASE is aborted. (Microsoft SQL Server, Error: 9003)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&EvtSrc=MSSQLServer&EvtID=9003&LinkId=20476

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BUTTONS:

OK
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