I also had this problem (Volt issue... it is not generating the apk file - #15 by Jim) and thought it had fixed itself. What probably (?) fixed it was that I had unwittingly generated a 1.8Mb 2732x2732 splash screen image. When I reduced this to approx 500k or used the default screen, the build worked. No idea why or whether this was the actual fix.
Not saying this will be the case in your situation but the Windows build and the error message are the same.