FYI, I've just edited the command. In ZivaVFX 1.3, it will print:
// Error: ziva 2018-01-16 16:18:41.285 ERR| zFindIntersections expects two selected meshes, but found one. Consider using zFindSelfIntersections //
or
// Error: ziva 2018-01-16 16:18:26.324 ERR| zFindIntersections expects two selected meshes, but found 0 //