Yocto and reTerminal

I am trying to compile on the command line an image for the reTerminal using Yocto. I followed the directions (to the best of my ability) on the Wiki Yocto - Seeed Wiki but the build fails.

Ubuntu 20.04 guest inside virtualbox, 6 core, 8192 MB RAM, 200 GB disk
The first error appears when I issue bitbake:

~/poky/build$ bitbake rpi-test-image
Loading cache: 100% |                                           | ETA:  --:--:--
Loaded 0 entries from dependency cache.
ERROR: ParseError at /home/yocto/poky/meta-openembedded/meta-oe/recipes-extended/mraa/mraa_git.bb:21: Could not inherit file classes/setuptools3-base.bbclass

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

Any pointers?

There have been no replies. I had to switch over to VMware Player to achieve a stable ubuntu 20.04 client. I have built poky for qemux86 and the yocto image runs.

yocto@ubuntu:~/poky/build$ bitbake rpi-test-image
ERROR: Error executing a python function in exec_python_func() autogenerated:

The stack trace of python calls that resulted in this exception/failure was:
File: 'exec_python_func() autogenerated', lineno: 2, function: <module>
 *** 0002:oecore_update_localconf(d)
File: '/home/yocto/poky/meta/classes/sanity.bbclass', lineno: 56, function: oecore_update_localconf
     0053:is a good way to visualise the changes."""
     0054:    failmsg = d.expand(failmsg)
 *** 0056:    raise NotImplementedError(failmsg)
     0059:SANITY_SITECONF_SAMPLE ?= "${COREBASE}/meta*/conf/site.conf.sample"
     0060:python oecore_update_siteconf() {
Exception: NotImplementedError: Your version of local.conf was generated from an older/newer version of
local.conf.sample and there have been updates made to this file. Please compare the two
files and merge any changes before continuing.

Matching the version numbers will remove this message.

"meld conf/local.conf /home/yocto/poky/meta*/conf/local.conf.sample"

is a good way to visualise the changes.

I am new to yocto - but I’ve seen this error before with outdated build systems. Can anyone give me pointers? I now have 10 reTerminals that I need to deploy.