Film came out blank

I’ve developed 16 rolls of film at home with the vine still c-41 kit. I haven’t developed any film for like 4 months. This is how 2 rolls came out with the same chemicals and same steps. What went wrong?

I’ve developed 16 rolls of film at home with the vine still c-41 kit. I haven’t developed any film for like 4 months. This is how 2 rolls came out with the same chemicals and same steps. What went wrong?