Virtualbox still shows me VT-x unaveable

I wanted to install Kali Linux on VirtualBox in my Lenovo ThinkPad.

At first, this error showed up:

Failed to open a session for the virtual machine Kali-Linux-2019.3-vbox-amd64 1.

(VERR_NEM_MISSING_KERNEL_API).

VT-x is not available (VERR_VMX_NO_VMX).

Result Code: E_FAIL (0x80004005)
Component: ConsoleWrap
Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed}

I have Hyper-V unchecked as well with other features, as well I have my virtualization enabled but still getting the same issue.

What can I do?