It means your data is corrupt. You can try clicking on Rebuild (make a backup when it asks you), and it will try to fix the error, but my experience is that this error is not fixable in most cases.
An option is to restore from a backup, if you have a recent one.
Another option is to work with your Adagio consultant to repair the data using their copy of GridView ReadWrite. If they are not sure how to do this, have them email me at steve@sschwartzcpa.com
Another option is to find a not-so-recent backup and merge the batches from the corrupted data onto the restored backup. This is a little trickier and if your consultant is not sure about this, have them ask me.
The last resort, because it costs the most money, is to send your data to Softrak to be repaired.
Steve