Hello Yunhui,
Please install both SOURCE ISO and CACHE ISO fro PPCE500V2, the Cache ISO contains build binaries to accelerate the building to avoid perform your build from the scratch.
The folder sstate-cache should be created when installing the Cache ISO.
In addition, please install ISOs with the normal user permission rather than root permission.
If your problem remains, please attach your build log.
Have a great day,
Yiping
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