The IDE device (disks/CD-ROM) configuration is incorrect

Hello colleagues,
I have error when try to run VM with attached iso image.
An error was received from the ESX host while powering on VM VMNAME.
Failed to start the virtual machine.
The IDE device (disks/CD-ROM) configuration is incorrect. There is an IDE slave with no master at ide0:1. This configuration does not work correctly in virtual machines. Move the disk/CD-ROM from ide0:1 to ide0:0 using the configuration editor.
Is it possible to mount iso image as master from OpenNebula?