get image from folder

Hi!

i created a cdt with an imageID then in an interface i designed a file upload with the target pointing to a documents folder and a save into and value of ri!product.imageId, now on an approval interface i want to display those images, i tried this:  a!documentImage(todocument(tointeger(ri!product.imageId))).document but i get this as an error: Interface Definition: Expression evaluation error at function a!imageField [line 77]: An image gallery component [label="Item's Pictures"] has an invalid value for "images" at index 1. None of the values in "images" can be null. 

Is it because i didnt save to the database yet or another problem?

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