Symptoms
I would like to create a Mac OS X Yosemite virtual machine but unable to do that because of "no entry" sign.

Cause
VM misconfiguration.
Resolution
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Shut down the Virtual Machine. Make sure that the virtual machine is shut down. If it is in a suspended state, please run it and then shut down (Actions > Shut Down).
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Open your virtual machine's Configuration > Hardware Tab > Boot Order > Advanced.
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Add the following boot flag into the Boot flags field:
vm.efi.mac_recovery=1 - Start the virtual machine.
 
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