pvcreate error on partition

pvcreate error on partition

I can not create the partition, I get this error shown below :
Device /dev/mapper/vg_paperino-lv_rootp1 not found (or ignored by filtering)
Below also carry all the steps that I do on Centos:
[root@pippo ~]# fdisk /dev/mapper/vg_paperino-lv_root

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').

Command (m for help): p

Disk /dev/mapper/vg_paperino-lv_root: 18.8 GB, 18832424960 bytes
255 heads, 63 sectors/track, 2289 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xdb344dbe

                          Device Boot      Start         End      Blocks   Id  System
/dev/mapper/vg_paperino-lv_rootp1               1           3       24066   83  Linux
Command (m for help): q
[root@pippo ~]# pvcreate /dev/mapper/vg_paperino-lv_rootp1
Device /dev/mapper/vg_paperino-lv_rootp1 not found (or ignored by filtering).