[Q] nexus 5 stuck in boot animation topic

my nexus 5 is stuck in the boot animation screen. i dont have the usb debugging enabled on it. i tried to wipe cache and do a factory reset but both didnot work. i am getting error messages

E: failed to mount /cache (invalid argument)
E: cant mount /cache/recovery/log
E: cant open /cache/recovery/log

what should i do?