大佬求助，我在执行完第八步以后，出现了如下报错，但是目录下却生成了pgm和yaml文件，不知道有没有问题？

================================================================================REQUIRED process [cartographer_assets_writer-1] has died!
process has finished cleanly
log file: /home/starskabi/.ros/log/4d9f46d4-bf3d-11ea-8f3f-d8cb8a5b2081/cartographer_assets_writer-1*.log
Initiating shutdown!