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Good day, OceanPlanet.
You'll want to delete and recreate the invoice. This is to determine whether the transaction is corrupted or damaged. Just open the invoice and click on the Delete button.
If you're still unable to send the invoice, I recommend running the QuickBooks Refresher tool to help fix common errors. I'll guide you how.
Otherwise, download and run the Verify and Rebuild tool. This helps detect any issues in your company file and corrects them.
I've added an article in case you want to create custom email templates in QuickBooks.
Please keep us posted if you have any other concerns. We're always here to help.