Stochastic Slow Strategy

Hello folks!

I wanna use a slow stochastic indicator in ctrader, but coundt make it work. As I see there's no Native slow stochastic in ctrader, then i found this one that seems to be exactly what i need , but i could not make it work:

I tried to download and install, and also tried to copy the code to a New indicator using cAlgo, but It doesnt work. 

I see the indicator in the indicators list, but once i click nothing happens. The objects list shows and active indicators, but It doesnt open the stochastic tab, i dont see the lines.

How can I make it work?

Thanks a lot!