404 using cherrypy.tree.mount

I am using CherryPy-5.3.0, mod_wsgi-4.4.21, and apache-2.4

When I use cherrypy.Application(), I get the expected response.

I want to migrate to using cherrypy.tree.mount(), but I always see 404.

myproject.wsgi (attached) has a function get_app(), where I try to use 
either cherrypy.Application() or cherrypy.tree.mount().

In case it matters, my apache config:
        WSGIScriptAlias  /cherrypy 
/var/www/localhost/wsgi/project_cherrypy/myproject.wsgi
        <Directory "/var/www/localhost/wsgi/project_cherrypy">
            AllowOverride None
        Options None
        Require all granted
        </Directory>

--------------------------------------------
Logs when I use cherrypy.tree.mount():
--------------------------------------------
==> /var/log/apache2/error_log <==
[Mon May 02 21:15:06.429073 2016] [wsgi:info] [pid 18153] [client 
::1:51425] mod_wsgi (pid=18153, process='', 
application='localhost|/cherrypy'): Reloading WSGI script 
'/var/www/localhost/wsgi/project_cherrypy/myproject.wsgi'.

==> /var/log/apache2/access_log <==
::1 - - [02/May/2016:21:15:06 -0700] "GET /cherrypy/joe/ HTTP/1.1" 404 745

==> logs/access.log <==
::1 - - [02/May/2016:21:15:06] "GET /cherrypy/joe/ HTTP/1.1" 404 745 "" 
"Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0"

----------------------------------------------
Logs when I use cherrypy.Application() :
----------------------------------------------
==> /var/log/apache2/error_log <==
[Mon May 02 22:00:50.174465 2016] [wsgi:info] [pid 18154] [client 
::1:51788] mod_wsgi (pid=18154, process='', 
application='localhost|/cherrypy'): Reloading WSGI script 
'/var/www/localhost/wsgi/project_cherrypy/myproject.wsgi'.

==> /var/log/apache2/access_log <==
::1 - - [02/May/2016:22:00:50 -0700] "GET /cherrypy/joe/ HTTP/1.1" 200 9

==> logs/access.log <==
::1 - - [02/May/2016:22:00:50] "GET /cherrypy/joe/ HTTP/1.1" 200 9 "" 
"Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0"

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