is it possible to make the match number as variables???

[makecase]

i make a action design, and make the match number as {-Variable.Variable0-},
the variable0 is change from 0 to 10,
when i debug it and it show debug error and the message show Element is not found? why???

is it can not used the variable in the match???

 

[Hungry Bulldozer]

it can be used as match number. I guess something else is wrong. Please recheck