Your workbook may not actually corrupted. This error can occur for several reasons, but a common one is that during replay, one of the generated tables has no rows. A cause for that might be an intervening edit to one of the UDFs used in the workbook that results in a different outcome from one or more operations. Another possibility is that the source data files have changed since you last used the workbook, changing the results of operations. Do you happen to remember if you changed any UDFs or the data source files associated with this workbook? You may wish to file a support ticket to have a Xcalar support representative look at the logs to determine the precise cause of the error.
If a workbook was truly corrupted, you can ask your system administrator to recover it from a backup. Your workbook is represented by files in a shared Xcalar root filesystem, and your system administrator should have backups or snapshots from which a previous version of those files can be recovered.
Please let us know if this doesn't resolve your issue.