Error when use function document()

Hi,

Looks like the provided document id have null value (local!documentId). You can add null check condition to solve this issue. See below sample code

if(
  and(
    a!isNotNullOrEmpty(local!documentId),
    document(tofolder(local!documentId), "size") > 0
  ),
  true,
  false
)

In document function, you have to provide documentId not the folder id.

if(
  document(todocument(ri!documentId), "size") > 0,
  true,
  false
)

Create a rule with the below to check whether the document is valid or not.

a!localVariables(
  local!document: 46,/*ID for any document */
  local!contentData: if(
    isnull(local!document),
    null,
    getcontentobjectdetailsbyid(local!document)
  ),
  if(
    isnull(local!document),
    false(),
    and(
      not(
        exact(
          local!contentData,
          "No object with this ID has been found"
        )
      ),
      find("Type: Document", local!contentData)
    )
  )
)

Where / how is the value of "local!documentId" being set?

try this for newly uploaded documents

validations: if(
  or(fv!files.size < 0),
  "Attachments must be at least 1kn. Remove: " &
    index(fv!files, "name", where(fv!files.size < 0), {}),
  ""
)