MacOS VirtualBox – Not Enough Free Space on OS X Base System While Installing El Capitan

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I am getting an error while installing OS on Virtual Box machine, that there is not enough free space as shown in the image. I allocated 20GB while setting up virtual machine, and 8.8GB is what apple says that I need here

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I went to disk Utility->Disk Utility of VirtualMachine and tried changing partitioning of the VM. It cant be done. It also shows the instructions I need to take, but the "Enable Journaling" command is greyed out. What could be the problem?

It also says I am using CD ROM media, but I am not. The El Capitan iso file, that was linked to VM in the Storage tab of setting up VM, is on Desktop.

These are the screenshots for better illustration.

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Best Answer

By accident I tried to install OS X to the OS X Installer DVD iso file (mounted to the virtual VBOX CD-ROM device) itself.

Erasing/partitioning the VBOX HARDDISK disk (see images in question) and creating a new HFS+ Journaled formatted volume seems to work.

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