[CentOS] create raid /dev/md2

Hi , currently i have 2 raid devices /dev/md0 and /dev/md1 , i have added 2
new disks, fdisked , created 2 primary partitions with type fd (linux raid
autodetect)
Now i want to create raid from them

root at vmhost1 ~]# mdadm --create --verbose /dev/md2 --level=1 /dev/sdc1
/dev/sdd1
mdadm: error opening /dev/md2: No such file or directory

will return that error, what shouldi do?

Thanks!
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