can't relock bootloader Huawei Y7 prime 7.0

i try to root and lock boot loader but error ......

customer want to relock bootloader because every time restart phone give error of bootloader unlocked....

Code:

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SigmaKey v.2.27.14
612082816 Sigma dongle 2.27, Initializing...OK
Pack 1: Activated
Pack 2: Activated
Pack 3: Not activated
--------- 2018-04-11 20:08:39 ---------
SigmaKey 2.27.14 ADB: Lock Huawei bootloader
* daemon not running. starting it now *
* daemon started successfully *
^ Android Composite ADB Interface
Version: Linux version 3.18.31-g67179ae-dirty (jslave@root1-RH2288H-V2-12L) (gcc version 4.8 (GCC) ) #2 SMP PREEMPT Wed Sep 13 16:58:19 CST 2017
Phone model: HUAWEI TRT-L21A
Android 7.0; Firmware: HUAWEITRT-L21A; Date: Wed Sep 13 16:52:41 CST 2017
Version: TRT-L21AC185B150
Baseband Firmware: 00022,00022
Baseband Processor: Qualcomm Technologies, Inc MSM8940
Version: TRT-L21AC185B150
Reading security block...Not found

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Guljee