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That message is telling you that there is a problem with accessing your the Calibre metadata.db file on the hard disk! It could be genuine hardware level error, or the Calibre metadata.db file could have been corrupted in some way.
What OS are you using? The first thing you should run is whatever utility the OS provides for checking the hard disk, and take whatever action is required to remedy the issue if there is an underlying hardware of filing system fault. This would fix most problems with a hard disk and rectify any file system level errors.
If the Calibre metadata.db database file is damaged then you will then either need to restore it from a backup, or use the calibre facility for restoring it by rebuilding it from the files in your Calibre library.
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