Wetriedtls.com error?

[Naanaa28]

Describe the bug I tried downloading this book from them and it loads alright, but by the end I get this error and the file doesn't save.

To Reproduce Steps to reproduce the behavior:

1. Go to '...' https://wetriedtls.com/series/sss-class-hunter-who-dies-to-live
2. Click on '....' pack epub
3. Wait for the book to finish packing
4. See error

Expected behavior Like every other epub for a pop-up window to appear asking me to save the file.

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari] Chrome
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context Add any other context about the problem here.