2👍
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Upgrade to mod_wsgi 3.3. Don’t use mod_wsgi 2.X. Read:
http://blog.dscpl.com.au/2009/04/wsgi-and-printing-to-standard-output.html
In short, Python code somewhere is trying to use sys.stdin which technically means that code cannot be used portably on all WSGI implementations. Older mod_wsgi versions tried to highlight this to force people to write portable code. Such checks are no longer done in mod_wsgi 3.3 and it allows people to write non portable code.
Source:stackexchange.com