error

i have configured it 

   a!fileUploadField(
          label: "File Upload",
          labelPosition: "ABOVE",
          target: tofolder(
            ri!folderId_int
          ),
          value: index(
            fv!item,
            "docId_int",
            ""
          ),
          saveInto: {
            fv!item.docId_int,
            if(
              rule!APN_isBlank(
                fv!item.docId_int
              ),
              {},
              a!save(
                fv!item,
                updatedictionary(
                  dictionary: fv!item,
                  fieldsAndValues: {
                    updatedOn_dt: if(
                      not(
                        isnull(
                          fv!item.id_int
                        )
                      ),
                      now(),
                      {}
                    ),
                    folderId_int: ri!folderId_int,
                    folderRowId_int: ri!folderRowId_int,
                    updatedBy_txt: if(
                      not(
                        isnull(
                          fv!item.id_int
                        )
                      ),
                      loggedInUser(),
                      {}
                    ),
                    updatedByRole_txt: if(
                      not(
                        isnull(
                          fv!item.id_int
                        )
                      ),
                      rule!CR_FN_getUserRole(
                        inputUser_txt: loggedInUser()
                      ),
                      {}
                    )
                  }
                )
              )
            )
          },
          maxSelections: 1,
          validations: {
            a!localVariables(
              local!invalidExtensions: difference(
                upper(
                  fv!files.extension
                ),
                {
                  cons!CR_CUST_FILE_EXTENSION
                }
              ),
              if(
                length(
                  local!invalidExtensions
                ) > 0,
                cons!CR_CUST_VALIDATION_MESSAGE[1] & index(
                  fv!files,
                  "name",
                  wherecontains(
                    local!invalidExtensions,
                    upper(
                      fv!files.extension
                    )
                  ),
                  {}
                ),
                ""
              )
            ),
            if(
              or(
                fv!files.size > cons!CR_CUST_MAX_UPLOAD_FILE_SIZE
              ),
              cons!CR_CUST_VALIDATION_MESSAGE[2] & index(
                fv!files,
                "name",
                where(
                  fv!files.size > cons!CR_CUST_MAX_UPLOAD_FILE_SIZE
                ),
                {}
              ),
              ""
            )
          }
        ),