How to lock the bootloader?

[4dark]

It continues saying No Valid PIV block in SP for system piv validation failed (system) Re-lock failure.
I use these commands

C:\Users\x\AppData\Local\Android\sdk\platform-tools>fastboot oem lock
...
(bootloader) FAIL: Please run fastboot oem lock begin first!
OKAY [ 0.131s]
finished. total time: 0.133s

C:\Users\x\AppData\Local\Android\sdk\platform-tools>fastboot oem lock begin
...
(bootloader) Ready to flash signed images

OKAY [ 0.247s]
finished. total time: 0.249s

C:\Users\x\AppData\Local\Android\sdk\platform-tools>fastboot oem lock
...
(bootloader) Re-Lock Failure. See display.
OKAY [ 0.536s]
finished. total time: 0.538s

I don't have any stock rom of xt1052 RETDE, anyone can help me?