Exception raised by tbwiki software

Traceback (most recent call last):
  File "/home2/birdorg/public_html/cgi-bin/tbwiki.cgi", line 54, in 
    main(req)
  File "/home2/birdorg/work/tbwiki/cgi-bin/tbwiki_engine.py", line 2888, in main
    log_actions = scan_log(req, req.page_name)
  File "/home2/birdorg/work/tbwiki/cgi-bin/tbwiki_engine.py", line 1238, in scan_log
    for line in log.xreadlines():
AttributeError: '_io.TextIOWrapper' object has no attribute 'xreadlines'