Cannot start the Virtual Machine which has been created in Virtualbox

I download a android-x86 8.1-r1 .iso. Using Virtuabox-6.0, after creating the VM with default values, I go to setting to load in the .iso. When I click ‘Start’, a window pops up with a msg about exit code1, which from surfing, seems a common experience by many other users.

I have tried android-x86 nougat and marshmallow with same result.

My laptop has a i7-8550 processor with 8G ram.

Any suggestions?