This kernel requires the following features not present: pae

Today I have tried to install RHEL6 i386 as a virtual machine using virtualbox. Right after startup I got a error message saying:

This kernel requires the following features not present: pae
Unable to boot - please use a kernel appropriate for your CPU

If you get this error enable PAE/NX on your virtual machine by navigating to:

Settings->System->Processor->Extended Features and tick: PAE/NX

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