If you're facing this error while creating your labels, don't panic! 🙌
In this case it's possible that too many orders have been selected at the same time, or that the PDF files are corrupted.
What can I do?
In order to correctly generate the labels you can:
Try to click on the pencil icon under Action column to update, and therefore fix, them.
Select a lower number of orders to fulfill simultaneously.
Done! 🎈