Execute and score command help

So basically i need a command that can teleport a mob in particular in a place in particular when the Timer ( that i already made ) reach a certain number. I've been using the /execute as @p[score... command for while for this and since yesterday it just stopped working and it says " no targets matched selector ". I also tried using the /execute if score @p... but it always teleport back the mob at his starting place when the Timer go beyond the define number.

Ex: Execute if score @p matches 2 in a Timer that goes from 1 to 3, it will teleport the mob at 2 then teleport it back at 3 where he was.

I need help please