CASA plugin problem

Dear all,

Let me introduce myself quickly, I am a researcher at the University of Namur (Belgium). I work mainly on the sperm quality of the Atlantic salmon Salmo salar.
I take the liberty to contact you because I have a problem using the CASA plugin on ImageJ of Fiji. I was using the plugin this summer by oppening AVI.files and it was OK.
I tried to use it again a few days ago but unfortunately without success. Everything is going well and I have the possibility to open my AVI file, the CASA plugin and to enter the necessary parameters for the sperm tracker (i.e. a–> Minimum sperm tracker etc…). Nevertheless, whereas before I had the results displayed directly, nothing happens anymore, would you have an idea of the problem that could explain this lack of results?

Thank you in advance