The scene that used to be baked well before is getting a nonzero error and it’s not rendered. I imported a new scene and tried putting a new material on it, but it still doesn’t solve it. I’ve emailed you the link of the scene in question. Please help. I’d like to complete it.
We are looking into this issue, we will let you know once we know more about this problem.
The problem with this scene is that it contains a lot of degenerate geometry. In general Shapespark can handle degenerate triangles, but on this scene there is apparently too much of those 
For example object Cube051_1 has 180000 triangles, all degenerated into a single vertex.
We will fix the algorithms so that such geometry will be handled properly, but it might take a few days until we release a next version with a fix. For now if you could remove some of those degenerates from the scene (at least those with large number of vertices), then that should solve your problem.
This issue is fixed in the latest Shapespark version (3.2.0).