Exception raised by tbwiki software

Traceback (most recent call last):
  File "/home2/birdorg/public_html/cgi-bin/fuego-1.2.cgi", line 70, in 
    main(req)
  File "/home2/birdorg/work/tbwiki/cgi-bin/tbwiki_engine.py", line 2865, in main
    patc = re.compile(".*"+search_string)
  File "/usr/lib64/python3.9/re.py", line 252, in compile
    return _compile(pattern, flags)
  File "/usr/lib64/python3.9/re.py", line 304, in _compile
    p = sre_compile.compile(pattern, flags)
  File "/usr/lib64/python3.9/sre_compile.py", line 788, in compile
    p = sre_parse.parse(p, flags)
  File "/usr/lib64/python3.9/sre_parse.py", line 969, in parse
    raise source.error("unbalanced parenthesis")
re.error: unbalanced parenthesis at position 36