N1SDP bitbake error

Hi, I was following 

https://community.arm.com/developer/tools-software/oss-platforms/w/docs/457/n1sdp-getting-started-guide

I think I exactly followed it (on my ubuntu 16.04, I had to install python 3.6 from source with sqlite support and gcc 6.0 ).

Not at the final bitmake command, I get following error. Can anyone help me please?

(I asked support@arm too so I might get answer from there and will post it here.)

ckim@chan-ubuntu:~/N1SDP/20201229/n1sdp_workspace/bsp/build-poky$ bitbake core-image-base
ERROR: Command execution failed: Traceback (most recent call last): | ETA: --:--:--
File "/home/ckim/N1SDP/20201229/n1sdp_workspace/bsp/bitbake/lib/bb/command.py", line 114, in runAsyncCommand
self.cooker.updateCache()
File "/home/ckim/N1SDP/20201229/n1sdp_workspace/bsp/bitbake/lib/bb/cooker.py", line 1603, in updateCache
self.parser = CookerParser(self, mcfilelist, total_masked)
File "/home/ckim/N1SDP/20201229/n1sdp_workspace/bsp/bitbake/lib/bb/cooker.py", line 2067, in __init__
self.bb_caches = bb.cache.MulticonfigCache(self.cfgbuilder, self.cfghash, cooker.caches_array)
File "/home/ckim/N1SDP/20201229/n1sdp_workspace/bsp/bitbake/lib/bb/cache.py", line 799, in __init__
loaded += c.prepare_cache(progress)
File "/home/ckim/N1SDP/20201229/n1sdp_workspace/bsp/bitbake/lib/bb/cache.py", line 403, in prepare_cache
self.logger.debug(1, "Cache dir: %s", self.cachedir)
File "/home/ckim/N1SDP/20201229/n1sdp_workspace/bsp/bitbake/lib/bb/__init__.py", line 50, in bbdebug
if self.name in bb.msg.loggerDefaultDomains and loglevel > (bb.msg.loggerDefaultDomains[self.name]):
AttributeError: 'PrefixLoggerAdapter' object has no attribute 'name'

Summary: There was 1 ERROR message shown, returning a non-zero exit code.