HELP! Particle loop through tunnel with TyLooper?

[ADN]

Hello. Good morning.

I am trying to use TyLooper to loop a blood stream.

I have a base particle system.
A red blood cell as a shape.
A PathFollow to direct the red blood cells through the path.
Then I apply a TyLooper... but I don't see a loop.

I'm sure I'm doing something wrong, but I don't know exactly what.

I followed this tutorial▼
https://youtu.be/LZnZu0j3ChY

Is TyCache really necessary?

Any suggestion? :S

Greetings and thank you very much.