Are you launching QuPath by double-clicking on an SVS file, or do you start QuPath separately and then drag your SVS file on top of it to open it?
My guess is the first one, because "Failed to launch JVM" sounds like QuPath can't start at all - and fails before even trying to open the images.
Is this correct? If so, if you just try to launch QuPath separately - without opening any image - does that work?
If you can start QuPath, do you see any error messages under View -> Show log?
Finally, are you using QuPath v0.1.2 or some other version?