thanks for kind reply. so I decided and have tried to downgrade, but ended up in a terrible disaster..
in order to downgrade to 2.2.0, I executed the following commands according to the source installation guide.
rm -fr /opt/CellProfiler
rm -fr /usr/local/bin/cellprofiler
rm -fr /usr/lib/python2.7/dist-packages/*
sudo git checkout 2.2.0
sudo pip install --editable . --process-dependency-links
sudo pip uninstall prokaryote
sudo pip install prokaryote
sudo pip install javabridge
and then when I try python Cellprofiler.py, it says..
File "/opt/CellProfiler/cellprofiler/preferences.py", line 111, in get_config
ImportError: No module named wx
what drives me crazy is that the same message appears after I reinstalled the stable release (3.0.0)!!!! so now I can't run CellProfiler anymore.
what should I do now? I think something went wrong because of the 'rm -fr /usr/lib/python2.7/dist-packages/*' command but don't know what to do......