不能将QString转换为Const Char* ?

I'm new to QT so please excuse me if I'm blatantly doing something wrong here, but I've looked at all the questions here on the matter but can't seem to find something that works. I'm trying to have the user create a folder by entering a name for it, and it 'creates' a folder with the name. I say 'create' because it's not exactly creating one, it makes a folder first called "project" before you enter the name, and when you enter a name it renames it. However, when I try and rename the folder with the inputted name it gives me I'm new to QT so please excuse me if I'm blatan