[mod_python] Problem doing PSP redirect

In the code of my PSP page a do a psp.redirect(somestringvalue) and I
receive this trace:
 
Mod_python error: "PythonHandler mod_python.psp"

Traceback (most recent call last):

  File "C:\Utilities\Python23\Lib\site-packages\mod_python\apache.py",
line 299, in HandlerDispatch
    result = object(req)

  File "C:\Utilities\Python23\Lib\site-packages\mod_python\psp.py", line
297, in handler
    p.run()

  File "C:\Utilities\Python23\Lib\site-packages\mod_python\psp.py", line
208, in run
    exec code in global_scope

  File "C:/Program Files/Apache
Group/Apache2/htdocs/RegistrationTwo/RegistrationPageUpdate.psp", line
21, in ?
    psp.redirect(req.url)

  File "C:\Utilities\Python23\Lib\site-packages\mod_python\psp.py", line
84, in redirect
    util.redirect(self.req, location, permanent)

  File "C:\Utilities\Python23\Lib\site-packages\mod_python\util.py",
line 371, in redirect
    req.err_headers_out["Location"] = location

TypeError: table values must be strings
 
The value which I am passing as the redirect URL (req.url) is a string.
I even print it to a log and it is a totally valid URL address. Why am I
getting this error ?
 
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