NameError: global name 'ConnectionError' is not defined

[nemobis]

Analysing http://kk.encyclopedia.kz/api.php
Trying generating a new dump into a new directory...
Loading page titles from namespaces = all
Excluding titles from namespaces = None
16 namespaces found
    Retrieving titles in the namespace 0
..............................................................................................    46726 titles retrieved in the namespace 0
    Retrieving titles in the namespace 1
.    3 titles retrieved in the namespace 1
    Retrieving titles in the namespace 2
.    2 titles retrieved in the namespace 2
    Retrieving titles in the namespace 3
.    2 titles retrieved in the namespace 3
    Retrieving titles in the namespace 4
.    1 titles retrieved in the namespace 4
    Retrieving titles in the namespace 5
.Traceback (most recent call last):
  File "./dumpgenerator.py", line 2323, in <module>
    main()
  File "./dumpgenerator.py", line 2315, in main
    createNewDump(config=config, other=other)
  File "./dumpgenerator.py", line 1880, in createNewDump
    getPageTitles(config=config, session=other['session'])
  File "./dumpgenerator.py", line 429, in getPageTitles
    for title in titles:
  File "./dumpgenerator.py", line 276, in getPageTitlesAPI
    except ConnectionError as err:
NameError: global name 'ConnectionError' is not defined
tail: cannot open ‘kkencyclopediakz-20200209-wikidump/kkencyclopediakz-20200209-history.xml’ for reading: No such file or directory
No </mediawiki> tag found: dump failed, needs fixing; resume didn't work. Exiting.