Nandflash boot ubifs boot fail , why?

3.204807] ubi0: scanning is finished
[ 3.235454] ubi0 error: vtbl_check: bad CRC at record 2: 0xf116c36b, not 0x59896beb
[ 3.243105] Volume table record 2 dump:
[ 3.246925] reserved_pebs 0
[ 3.249983] alignment 0
[ 3.253025] data_pad 0
[ 3.256066] vol_type 0
[ 3.259121] upd_marker 0
[ 3.262163] name_len 0
[ 3.265205] name NULL
[ 3.268533] ubi0 error: vtbl_check: bad CRC at record 2: 0xf116c36b, not 0x59896beb
[ 3.276156] Volume table record 2 dump:
[ 3.279989] reserved_pebs 0
[ 3.283033] alignment 0
[ 3.286073] data_pad 0
[ 3.289128] vol_type 0
[ 3.292169] upd_marker 0
[ 3.295209] name_len 0
[ 3.298250] name NULL
[ 3.301571] ubi0 error: ubi_read_volume_table: both volume tables are corrupted
[ 3.309177] ubi0 error: ubi_attach_mtd_dev: failed to attach mtd7, error -22
[ 3.316234] UBI error: cannot attach mtd7
[ 3.320258] hctosys: unable to open rtc device (rtc0)
[ 3.325289] of_cfs_init
[ 3.327768] of_cfs_init: OK
[ 3.331316] ttyS0 - failed to request DMA
[ 3.335487] VFS: Cannot open root device “ubi0:rootfs” or unknown-block(0,0): error -19
[ 3.343521] Please append a correct “root=” boot option; here are the available partitions:
[ 3.351869] 0100 8192 ram0
[ 3.351874] (driver?)
[ 3.357962] 0101 8192 ram1
[ 3.357965] (driver?)
[ 3.364080] 1f00 512 mtdblock0
[ 3.364084] (driver?)
[ 3.370618] 1f01 512 mtdblock1
[ 3.370622] (driver?)
[ 3.377138] 1f02 512 mtdblock2
[ 3.377142] (driver?)
[ 3.383676] 1f03 512 mtdblock3
[ 3.383681] (driver?)
[ 3.390214] 1f04 6144 mtdblock4
[ 3.390218] (driver?)
[ 3.396734] 1f05 24576 mtdblock5
[ 3.396738] (driver?)
[ 3.403270] 1f06 12288 mtdblock6
[ 3.403275] (driver?)
[ 3.409806] 1f07 102400 mtdblock7
[ 3.409810] (driver?)
[ 3.416326] 1f08 40960 mtdblock8
[ 3.416330] (driver?)
[ 3.422863] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[ 3.431097] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.14.73-ltsi #7
[ 3.437510] Hardware name: Altera SOCFPGA