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This issue is already reported to our engineers, Christophealfaro.
They're currently investigating the cause of the error. A fix will be rolled out as soon as possible.
I suggest reaching out to our customer care support. We're taking notes of the users that are affected by this issue. Here's how:
In the meantime, you can print one invoice at a time. Once it's fixed, you can go back and print them by batch.
The Community is open 24/7. Get in touch with us if you have other concerns.