Virtualbox - Tails - failed to open disk image file

Host machine: OSX Mojave

Virtualbox: 6.0.4

Tails: 3.12

Where I download virtualbox: brew cask install virtualbox. NOTE: I had virutalbox installed quite awhile and using it with vagrant and ansible to test playbook and stuff, and did make sure everything was clean when trying to run tails.

Where I download the image file: from tails site download using torrent

How I attempted to run tails from ISO image in virtual box: steps follow from tails documentation, it was straightforward and tried it more than five times

Error occurred at: steps 7, from the tails doc at configuring virtual machine to start from an ISO image, and below are the detail error:

The medium '/my-path/tails-amd64-3.12.iso'
can't be used as the requested device type.


Result Code: NS_ERROR_FAILURE (0x80004005)
Component: MediumWrap
Interface: IMedium {ad47ad09-787b-44ab-b343-a082a3f2dfb1}
Callee: IVirtualBox {d0a0163f-e254-4e5b-a1f2-011cf991c38d}
Callee RC: VBOX_E_OBJECT_NOT_FOUND (0x80BB0001)

Expectation: No error popup at steps 7, which at the adding tails ISO image, and the rest of the step and could successfully start tails up

Attemps to get it work:

Attempt one: I watched one video from youtube that was about 7 months ago running tails in virtualbox, the process was pretty straightforward but I still get the same error.

Attemp two: I googled about the issue and only found simliar error. Those are conflicting Disk ID, which I applied the solution but got no luck.

I don't really use virtualbox much so are there anyway I can know more about the error message or anyone knows how to do with this? Thanks beforehand and appreciate for your precious time and help.

It is working now, the weird thing is that I have to directly open the .iso image instead of clicking on the folder that contains the .iso.