Traceback (most recent call last):
  File "/data/project/heritage/pywikibot/pwb.py", line 263, in <module>
    if not main():
  File "/data/project/heritage/pywikibot/pwb.py", line 257, in main
    run_python_file(filename, [filename] + args, argvu, file_package)
  File "/data/project/heritage/pywikibot/pwb.py", line 121, in run_python_file
    main_mod.__dict__)
  File "/data/project/heritage/erfgoedbot/missing_commonscat_links.py", line 19, in <module>
    import common as common
  File "/data/project/heritage/erfgoedbot/common.py", line 5, in <module>
    from builtins import open
ImportError: No module named builtins