that just means you have to go into the files and rename the file. put a space between "plant" and "girl", worked for me
I also suggest making a copy of some of the files and renaming it the other, like "Slum Male Faces.rpgmvp" and "Slummalefaces.rpgmvp", because there's stuff that checks for both. Luckily you can do that in the middle of playing.
oh thank god you said that, I had a similar problem but know I can fix it. But unfortunately I still lost most of my progress on that run.