How do I fix the Xero Sync Error: 'The document date cannot be before the end of year lock date'?

How do I fix the Xero Sync Error: 'The document date cannot be before the end of year lock date'?

Details
Title
How do I fix the Xero Sync Error: 'The document date cannot be before the end of year lock date'?
URL Name
kb-3537534978-how-do-i-fix-the-xero-sync-error-the-document-date-cannot-be-before-the-end-of-year-lock-date