I'm getting an issue attempting to run this line that is possibly caused by my windows username having a space in it. Not the best thing, but then I didn't choose it in this case. Java is telling me it can't find anything in "C:/Users/Alexander" because the name put on this pc was my full name, and it seems it can't handle spaces in folder names. Who knows, maybe that is causing the launcher to crash out, at least for me.