> detect user environment:
I0101 00:01:44.361453 1093 mpi_sys.c:1074] <MonitorEnvVarThread> /tmp/mpp_log_level
I0101 00:01:44.361671 1093 mpi_sys.c:1075] <MonitorEnvVarThread> /tmp/mpp_venc_sei_config_param
open /sys/class/sunxi_info/sys_info failed.
I0101 00:01:44.407266 1082 ai_facekit.c:186] <ai_init> file:/mnt/extsd/pix_allwinner_facekit_v1.4.bin,size:2451836
load_file: /mnt/extsd/pix_allwinner_facekit_v1.4.bin
**Fail to verify license key**
E0101 00:01:44.465355 1082 ai_facekit.c:204] <ai_init> pix_init_facekit_model error status: -8888
open /sys/class/sunxi_info/sys_info failed.
0x000x000x000x000x000x000x000x000x040x000x000x000x2c0x000x000x000xd40xff0xff0x7f0x000x000x000x000x000x000x000x000x000x000x000x00
E0101 00:01:44.474221 1082 sample_facekit_demo.c:1520] <main> init error!
打开模型文件时提示验证license key错误，请问这个问题该怎么解决呢？