To Rectify when the Error Message 'Structural.CDX file is not found.' prompt:
Click Cancel until you can log in to the database
The system will let you continue.
Go to Housekeeping, File re-organization, Upgrade, Upgrade Data Files, OK, OK.
Go to Housekeeping, File Re-organization, index All Files, OK, OK.
Note: If the error persists and unable to follow the guidelines means that the database is corrupted. Hence, you will need to create the company and restore the latest backup.