index value greater than array dimension

[LeeJaeYoung]

dim  WallskinThk[4]

WALL_SKINS_NUMBER = 4

i use WallskinThk[4]

Sometimes the error message doesn't come out, then it comes up again.

Saving is possible, but it doesn't feel good.

[SenecaDesignLLC]

The array is defined by the number of skins in the wall. So if at any time it's related to a wall with less than 4 skins you will get this error

[LeeJaeYoung]

So how should I set it up?

[SenecaDesignLLC · Accepted solution]

Assuming you always want the last skin, 

WallSkinThk[WALL_SKINS_NUMBER]

Seeing the actual code would make it much easier to help.

[LeeJaeYoung]

thank you so much

[LeeJaeYoung]

if WALL_SKINS_PARAMS[idx][SKIN_CORE_STATUS] > EPS then
            cumCoPen = WALL_SKINS_PARAMS[idx][SKIN_CONT_PEN]

endif

PEN cumCoPen

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Error occurs here too.
What should I do?