can't start after install realtime kernel.

hey, i am installing the realtime-kernel by https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux_for_real_time/9/html-single/installing_rhel_9_for_real_time/index#doc-wrapper after installed redhat 9.2.
and standard kernel 5.14.0-284.18.1.el9_2.x86_64 works ok.

but when i switch default-kernel to rt, it does't work.

redhat version: 9.2
realtime kernel -version : 5.14.0-284.18.1.rt14.303.el9_2.x86_64

error message is in the picture.

anyone know about it?

// i did't install kdump service, I don't know if this is the cause of the problem