In case you ever encounter this error about a missing Source.xml file:

IOError: [Errno 2] No such file or directory: '/diskb/aginsbur/orion/2013.1.00546.S/science_goal.uid___A001_X122_X35c/group.uid___A001_X122_X35d/member.uid___A001_X122_X35e/calibrated/working/uid___A002_X960614_X39db.ms/Source.xml'
WARNING: Failure executing file: <scriptForPI.py>

the solution is this ticket: https://help.almascience.org/index.php?/Knowledgebase/Article/View/266/5/what-should-i-do-if-scriptforpi-aborts-at-the-importasdm-step-with-error

So my solution:

orion /diskb/aginsbur/atca master$ mv /diskb/aginsbur/casa/casapy-42.2.30986-pipe-1-64b/lib64/libxml2.so.2 /diskb/aginsbur/casa/casapy-42.2.30986-pipe-1-64b/lib64/origlibxml2.so.2
orion /diskb/aginsbur/atca master$ locate libxml2.so.2
/diskb/aginsbur/casa/casapy-42.2.30986-pipe-1-64b/lib64/libxml2.so.2
/diskb/aginsbur/casa/casapy-42.2.30986-pipe-1-64b/lib64/libxml2.so.2.6.26
/home/aginsbur/anaconda/lib/libxml2.so.2
/home/aginsbur/anaconda/lib/libxml2.so.2.9.2
/home/aginsbur/anaconda/pkgs/libxml2-2.9.2-0/lib/libxml2.so.2
/home/aginsbur/anaconda/pkgs/libxml2-2.9.2-0/lib/libxml2.so.2.9.2
/opt/anaconda/lib/libxml2.so.2
/opt/anaconda/lib/libxml2.so.2.9.2
/opt/anaconda/pkgs/libxml2-2.9.2-0/lib/libxml2.so.2
/opt/anaconda/pkgs/libxml2-2.9.2-0/lib/libxml2.so.2.9.2
/usr/lib64/libxml2.so.2
/usr/lib64/libxml2.so.2.9.1
orion /diskb/aginsbur/atca master$ ln -sf /usr/lib64/libxml2.so.2 /diskb/aginsbur/casa/casapy-42.2.30986-pipe-1-64b/lib64/libxml2.so.2