Using subdomains in Multi-domain plugin as options to create subsites in Multisite subdirectory


Referring to this thread which have similar situation:

I want to create a multisite, subdirectory, and want to use subdomains as options to create sub blogs.

For example, I added these subdomains in multi-domain settings:

Then, added A records,

Then when creating subblogs in multisite, they were under the above subdomains:

I got Internal Server Error in dir and dir1, in both in front-end and wp-admin

What do you think is the problem? Does the plugin function in this way? Is there anything wrong with the configuration?

Thanks in advance.