imagebutton using a variable as its image [SOLVED]

[vociferocity]

so I'm trying to write in some dynamic imagebuttons for my inventory that will show the item at each slot, regardless of the item, but I'm getting an error that says:

TypeError: not all arguments converted during string formatting

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imagebutton auto "[a_Inventory[0][3]]" action [ SetVariable('s_Message', a_Inventory[0][2]), Show('displaymessage') ]

that's my imagebutton code, and it works perfectly fine when instead of

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"[a_Inventory[0][3]]"

I have the actual filepath, but I'm not sure what the problem is with writing it like this

edit: in case anyone's interested, I solved my problem! originally, my code was like this:

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a_Inventory[0][3] = "art/inventory/bluehat_%s.png"
imagebutton auto "[a_Inventory[0][3]]" etc

which wasn't working! what does work, however, is this:

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$ im_bluehat = "art/inventory/bluehat_%s.png"
a_Inventory[0][3] = im_bluehat
imagebutton auto a_Inventory[0][3]

[Alex]

As it said in documentation, "auto" property should looks like <auto "save_%s.png">. So you have a variable to set the first part of image name used for button, but you've missed the rest part of it.
Try <auto "[a_Inventory[0][3]]_%s.png">, if images named like "apple_idle.png", "orange_hover.png" etc.
(not tested)

[vociferocity]

oh, the variable in question is actually set to

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"art/inventory/bluehat_%s.png"

, which works fine when I c/p it into the auto section instead of just calling the variable, so I don't think that's the problem