Trying to use virtualization inside a guest OS but error pops up?

KVM: no hardware support

on a ESXi host one can easy turn on the nested virtualization by editing the .vmx file

$ vim-cmd vmsvc/getallvms

make a note of vmID, file name and data store

$ cat << EOF >> /vmfs/volumes/$DATA_STORE/$FILE_NAME.vmx
vhv.enable = "TRUE"

$ vim-cmd vmsvc/reload $vmID