I cant add invoices or expenses anymore,I just get error with validation failed these books are closed ? Anyone know why ?

This error means a Close the books date in QuickBooks Online (QBO) is preventing changes to transactions on or before that date. Check the transaction dates, and if they fall within the locked period, an admin must enter the closing password or update the closing date to proceed.

If you have admin access, you can check your closing date settings by following these steps:

1. Go to the Gear icon and select Account and settings.
2. Choose the Advanced tab from the left menu.
3. Look in the Accounting section to view your closing date details.

For more information about this process, please refer to the article Edit your closed books in QuickBooks.

After completing these steps, you should be able to add invoices or expense transactions to your QBO account.

Please feel free to reach out if you have any questions about the error you are encountering when adding your transactions.