[mod_python] session's error

hi all:

i use code:

from mod_python import Session

sess = Session.Session(req)

if sess.is_new():

    sess['name'] = "test"

    sess.save()

then i find the session id from the browser,but the function save() was
report error:DBInvalidArgError: (22, 'Invalid argument')

how to resolve it??
Tomorrow is another day！！！

笑看人生！！！
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