My GUI procedure has errors.

So, I created a GUI, and it's perfectly fine, it has no errors. It's the procedure that has errors. Basically, what I want is for it to open up when the player spawns into the world. I've done that in the triggers, but my problem is that when I use the block that says open GUI, it also says open at X, Y, Z. It says the X Y Z aren't defined, and I don't want them to be defined. I want the GUI to open anywhere. That X, Y, Z thing wasn't there when I last used this procedure. Is that new? Anyway, please help me fix this. Thanks!