Subdirectory Site in Multisite Not Showing

I’m using wp multisite with a subdirectory blog on plesk. My main site is working fine, but my subdirectory site is not showing it showing page not found and I can not access the backend of the sub site. I can access the network admin. The url for the subdirectory site is http://diplomatconcierges.com/travel. Is it something in my .htaccess file? Here is the content of my .htaccess file.

Subdirectory site showing like this`
Server Error in Application “DIPLOMATCONCIERGES.COM”
Internet Information Services 7.5
Error Summary
HTTP Error 404.0 – Not Found
The resource you are looking for has been removed, had its name changed, or is temporarily unavailable.
Detailed Error Information
Module IIS Web Core
Notification MapRequestHandler
Handler StaticFile
Error Code 0x80070002
Requested URL http://diplomatconcierges.com:80/travel/
Physical Path C:\Inetpub\vhosts\diplomatconcierges.com\httpdocs\travel\
Logon Method Anonymous
Logon User Anonymous
Most likely causes:
The directory or file specified does not exist on the Web server.
The URL contains a typographical error.
A custom filter or module, such as URLScan, restricts access to the file.
Things you can try:
Create the content on the Web server.
Review the browser URL.
Create a tracing rule to track failed requests for this HTTP status code and see which module is calling SetStatus. For more information about creating a tracing rule for failed requests, click here.
Links and More Information
This error means that the file or directory does not exist on the server. Create the file or directory and try the request again.
View more information »

.htaccess file

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ – [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]