A good idea is to check the data source definitions. As far as I know, this error can also occur if there is data present, but the table structure is invalid. For example, I think, this is the case when you specify a monitorware schema (which is the default setting) but have syslog-ng database schema.
This is a repository of known Windows Events, hopefully together with a description of what it means, when it appears and how to troubleshoot it. The event repository was initially provided as a tool for parser creation but has since evolved. It is now part of the overall knowledgebase in the hope that it provides a useful service to the community. Please add your comments and questions (which we try to answer), as this increases the event repository usefulness for all of us.