TypeError: unsupported operand type(s) for %: 'NoneType' and 'tuple'

[Νίκος Γκρ33κ]

Here is the live error log coming form apacher when i request the webpage form browser:

==> /usr/local/apache/logs/error_log <==
[Sun May 26 19:07:41 2013] [error] [client 46.12.46.11] suexec failure: could not open log file
[Sun May 26 19:07:41 2013] [error] [client 46.12.46.11] fopen: Permission denied
[Sun May 26 19:07:41 2013] [error] [client 46.12.46.11] fopen: Permission denied
[Sun May 26 19:07:41 2013] [error] [client 46.12.46.11] Premature end of script headers: koukos.py
[Sun May 26 19:07:41 2013] [error] [client 46.12.46.11] Premature end of script headers: koukos.py

what is that suexec?