We have a few reports in SQL Server Reporting Services. For some reason when we run the report from the website, it doesn't return any data. When I run the same report from the Report Builder, it returns data.

I looked in the logs and the only errors I could find is:

ReportingServicesService!library!8!6/15/2012-08:12:33:: i INFO: Current DB Version Unknown, Instance Version C.0.8.54.
ReportingServicesService!library!8!6/15/2012-08:12:33:: e ERROR: Throwing Microsoft.ReportingServices.Diagnostics.Utilities.InvalidReportServerDatabaseException: The version of the report server database is either in a format that is not valid, or it cannot be read. The found version is 'Unknown'. The expected version is 'C.0.8.54'. To continue, update the version of the report server database and verify access rights., ;Info: Microsoft.ReportingServices.Diagnostics.Utilities.InvalidReportServerDatabaseException: The version of the report server database is either in a format that is not valid, or it cannot be read. The found version is 'Unknown'. The expected version is 'C.0.8.54'. To continue, update the version of the report server database and verify access rights.
ReportingServicesService!library!8!6/15/2012-08:12:33:: e ERROR: Exception caught while starting service. Error: Microsoft.ReportingServices.Diagnostics.Utilities.InvalidReportServerDatabaseException: The version of the report server database is either in a format that is not valid, or it cannot be read. The found version is 'Unknown'. The expected version is 'C.0.8.54'. To continue, update the version of the report server database and verify access rights.

I'm not really sure why it would be a different version. It's all SQL Server 2008 R2 and I haven't made any changes to it since it's been running.