Python application crash with error "ImportError: pyexpat.x86_64-linux-gnu.so: undefined symbol: XML_SetHashSalt" -


we use matlab's python engine interface matlab code python. there seems conflict used libexpact.so library.

a minimal buggy example be:

#!/usr/bin/env python xml.dom import minidom import matlab.engine  = minidom.parse("solution_example.xml") print(a)

this produces output:

  file "./minimal.py", line 9, in <module>     = minidom.parse("solution_example.xml")   file "/usr/lib/python2.7/xml/dom/minidom.py", line 1917, in parse     xml.dom import expatbuilder   file "/usr/lib/python2.7/xml/dom/expatbuilder.py", line 32, in <module>     xml.parsers import expat   file "/usr/lib/python2.7/xml/parsers/expat.py", line 4, in <module>     pyexpat import * importerror: /usr/lib/python2.7/lib-dynload/pyexpat.x86_64-linux-gnu.so: undefined symbol: xml_sethashsalt

however, program runs fine when line import matlab.engine omitted.

any ideas problem or how debug python import procedure?

thanks in advance!

i faced same error message morning , after looking around, found solution works me. re-post here. hope in future.

"it seems caused library conflicts libexpat. did ldd /usr/lib/python2.7/lib-dynload/pyexpat.so , realized libexpat.so.1 pointing /usr/local/lib/libexpat.so.1 rather /lib/x86_64-linux-gnu/libexpat.so.1 (the former referencing outdated version, 1.5.2 instead of 1.6.0). don't know libexpat in /usr/local/lib came from.

i hide libexpat files in /usr/local/lib (renamed .backup appended) , running ldd /usr/lib/python2.7/lib-dynload/pyexpat.so displays line "libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1" , update-manager works correctly."

https://ubuntuforums.org/showthread.php?t=2094005


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