Elias here with Shopify Support. Thank you for reaching out.
I understand that you're running into an error when trying to reprint shipping labels. Just to confirm, does clearing your browser's caches help resolve this issue? Also, does the issue persist across different browsers and/or devices?
If the issue persists, then it looks like we'll need to access your account in order to take a closer look at the issue. While we’re not able to provide account-specific support via the Shopify Community at this time, our Support team would be happy to continue assisting you through live chat, email, or callback. Please visit the Shopify Help Center and log in to your account to create a support request.
I'd love to know if clearing your browser's cache can help resolve the issue. Let me know!