Thank you Tushar, I have checked BIOS and virtualbox setting, all looks as expected. But the issue persistence.
My test environment is i installed Ubuntu in a virtualbox on my local PC. and now i'm going to install BOTH-LITE into the Ubuntu. (both is trying to startup VMs in the Ubuntu, then i get the error) There is a hint from internet that CPU can not be nested virtual. Is this true? If there is any way to overcome this limitation?
