Hi Palemos, what it means is you are trying to call, ie, use the array in a position that is above the number of elements you have allowed.
for
dim t(5)
you only have 5 positions/elements, actually you have six because in
arrays you can also use the 0 position.
you could go
for x= 1 to 5
t(x)=5
next x
the t is for the name of your array and the x in brackets is for the element in the array. the way it works is that the x in brackets is the same x as in the for to loop, so that is going from 1 to 5. in the end each of the elements in your array will equal 5