Description of my issue:
I had trouble upgrading from Akeeba Backup Pro 3.11.2 so I installed 4.0.4 and then upgraded that to 4.0.5 which seemed to work (no more AJAX errors).
I completed a backup but when I restore it, it gives me a 404 on the backend and many links are not working so I read the documentation that said it's probably only a partial restore.
I then went back to try again and now get the AJAX error once more.
I have run ALICE and tried the various troubleshooting steps but as it tells me the installation is broken I figure that there is something major wrong.
Log file is attached.
Thanks for your help.