I can't launch kernel rt

Good morning,
I just installed an rt kernel and I would like to use it from time to time, but here it is: it refuses to boot after selecting it in grub. A message appears telling me that the kernel must be loaded first. Does anyone have an idea of the problem and the solution to this?
Thank you in advance for your answers.

Does the kernel have a valid initramfs? Try rebuilding it with… :point_down:

sudo mkinitcpio -P && sudo update-grub
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I tried but it still doesn’t work. Here is the photo of the error