How can I fix the script errors?

I read this.
and I make it same. But it doesn't work. What is the problem?

I test his project, it is perfect working. But not mine

Is that you made manually from the first?

Maybe you should try this project :
inject.aia (2.5 KB)
:grin: :+1:

and why did you make 2 topics for it

I did it myself