You are missing a level of square brackets. You only have two dimensions rather than three.
(And you don't need to use RAR, save as CAPX - it does the same thing, and is the standard here for posting files).
{
"c2array":true,
"size":[
1,
1,
5
],
"data":
[
[
[
"5","2","3","4","5"
]
]
]
}
curteck You set the array sizes either in the array's properties tab or via the 'Array:Set size' action.