General Error when deleting account

Device: Desktop
Browser: Firefox
OS: Arch Linux

Steps to reproduce:

1. In the "Account Prefs" menu, I attempted to delete my account.
2. I authenticated successfully and performed the final confirmation that I do want to delete my account.
3. Upon waiting for a few seconds, I'm greeted with the following error message:
Anything else to add:

Please advise on how I should go about deleting my account from here. Thank you!