TestingBesuProxyModel.rst failed

[luokingkill]

when I run :

cd $TCF_HOME/docs/dev-environments/ethereum/besu ./startup.sh

I got a error :

Step 84/104 : RUN python3 -m solcx.install v0.5.15 ---> Running in 3ddb9e639621 /usr/bin/python3: Error while finding module specification for 'solcx.install' (ModuleNotFoundError: No module named 'solcx')
ERROR: Service 'avalon-shell' failed to build: The command '/bin/sh -c python3 -m solcx.install v0.5.15' returned a non-zero code: 1