Imported virtualhost and can't change name of home directory

I had already several virtualhost with nginx running when I installed Virtualmin

Therefore I went to Add Server->Import Virtual Server 1) Is this the correct approach?

2) But then I let the default home directory, which I realised it is not the directory where I have my site

Then later I went to Server Configuration->Change Domain Name to change the home directory to my current directory and I get

Failed to change domain name : New home directory already exists