Its because oxwall sees your sub domain as just another folder in the directory.  So you need to tell oxwall that you need to run that folder via the browser. 

see here  https://developers.oxwall.com/forum/topic/47116

Thanks!

I do what you said. But it does not work. It jump to http://www.aimphotos.com again when I visit via http://photo.aimphotos.com.

The content of .htaccess is:

Options +FollowSymLinks
RewriteEngine On

AddEncoding gzip .gz
AddEncoding gzip .gzip
<FilesMatch "\.(js.gz|js.gzip)$">
  ForceType text/javascript
</FilesMatch>
<FilesMatch "\.(css.gz|css.gzip)$">
  ForceType text/css
</FilesMatch>


#added to access custom files - sub domains or special folders
#--------
#subdomains and add on domains
#RewriteCond %{HTTP_HOST} !photo.aimphotos.com$
#

# folders

#RewriteCond %{REQUEST_URI} !/photo/viewlist/latest/

#

# files

#RewriteCond %{REQUEST_URI} !/index.php

RewriteCond %{REQUEST_URI} !^/index\.php
RewriteCond %{REQUEST_URI} !/ow_updates/index\.php
RewriteCond %{REQUEST_URI} !/ow_updates/
RewriteCond %{REQUEST_URI} !/ow_cron/run\.php
RewriteCond %{REQUEST_URI} !/e500\.php
RewriteCond %{REQUEST_URI} !/captcha\.php
#RewriteCond %{REQUEST_URI} (/|\.php|\.html|\.htm|\.xml|\.feed|robots\.txt|\.raw|/[^.]*)$  [NC]
RewriteCond %{REQUEST_FILENAME} (/|\.php|\.html|\.htm|\.xml|\.feed|robots\.txt|\.raw|/[^.]*)$  [NC]
RewriteRule (.*) index.php

Is there something wrong?

yes you have your two lines commented out..

#this is a comment

this is live code

RewriteCond %{HTTP_HOST} !photo.aimphotos.com$
#

# folders

RewriteCond %{REQUEST_URI} !/photo/viewlist/latest/

make it look like that 

Woo try the solution from here: https://my.bluehost.com/cgi/help/347

Thanks! Dave and Ross.

I have removed "#", but still jump back to www.domain.com

And I will take a look of the solution from bluehost.

Is there any conflict with origin lines in .htaccess?

Now, it is as below:

-----------------------------------------------

Options +FollowSymLinks

RewriteEngine On

AddEncoding gzip .gz

AddEncoding gzip .gzip

<FilesMatch "\.(js.gz|js.gzip)$">

  ForceType text/javascript

</FilesMatch>

<FilesMatch "\.(css.gz|css.gzip)$">

ForceType text/css

</FilesMatch>

#added to access custom files - sub domains or special folders

#--------

#subdomains and add on domains

RewriteCond %{HTTP_HOST} !photo.aimphotos.com$

#

# folders

RewriteCond %{REQUEST_URI} !/photo/viewlist/latest/

#

# files

RewriteCond %{REQUEST_URI} !/index.php

RewriteCond %{REQUEST_URI} !^/index\.php

RewriteCond %{REQUEST_URI} !/ow_updates/index\.php

RewriteCond %{REQUEST_URI} !/ow_updates/

RewriteCond %{REQUEST_URI} !/ow_cron/run\.php

RewriteCond %{REQUEST_URI} !/e500\.php

RewriteCond %{REQUEST_URI} !/captcha\.php

#RewriteCond %{REQUEST_URI} (/|\.php|\.html|\.htm|\.xml|\.feed|robots\.txt|\.raw|/[^.]*)$  [NC]

RewriteCond %{REQUEST_FILENAME} (/|\.php|\.html|\.htm|\.xml|\.feed|robots\.txt|\.raw|/[^.]*)$  [NC]

RewriteRule (.*) index.php

-----------------------------------------------