This support note applies to:
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AO Classic Tax (AU)
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AO Classic Practice Management (AU)
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AO Classic General Ledger (AU)
Article ID: 31270
When opening MYOB Accountants Office (AO) Classic you may experience the error "1561/invalid database".
To successfully opent MYOB AO Classic, delete the three CADATA files that are located in your Data folder.
Ensure that all users are logged out of MYOB AO and that you have a backup of your data before performing the procedure. For more details on backing up your data, refer to
Backing up my AO Classic dataRefer to Re-indexing AO Classic
If you are still experiencing the error after performing the procedure, contact MYOB Support for further assistance.