Looking at the logs, it appears you’re attempting to run Nucleus in a directory with utf characters in the name.
Unfortunately, this is not supported, and you’ll need to install and run Nucleus in a different directory with standard ansi characters.
Just to add for other users, my Windows account name was in Korean, which caused the error. It’s hard to rename a Windows account, so I created a new Windows account in English, but localhost didn’t appear in the NUCLEUS of the new Windows account. However, when I deleted nucleus from the old Windows account, I was able to find localhost in the new Windows account.