diff --git a/R/CST_Start.R b/R/CST_Start.R
index 4b78ee0c979e61a70384ef8ff45c61c829cb7644..12c1de5393c0ceafdca1b90641aa055f2791fdb1 100644
--- a/R/CST_Start.R
+++ b/R/CST_Start.R
@@ -13,6 +13,11 @@
 #'auxiliary startR functions (e.g. indices(), values(), Sort(), CircularSort(), 
 #'CDORemapper(), ...) can be used to define dimensions.
 #' 
+#'CST_Start() uses as.s2dv_cube() to transform the output into an s2dv_cube
+#'object. The as.s2dv_cube() function is designed to be used with data that 
+#'has been retrieved into memory. To avoid errors, please ensure that 
+#'CST_Start(..., retrieve = TRUE) is specified. 
+#'
 #'@param ... Parameters that are automatically forwarded to the `startR::Start` 
 #'  function. See details in `?startR::Start`.
 #'@examples 
@@ -33,7 +38,7 @@
 #'                                    latitude = c('lat', 'latitude')),
 #'                    return_vars = list(time = 'sdate',
 #'                                       longitude = NULL, latitude = NULL),
-#'                    retrieve = FALSE)
+#'                    retrieve = TRUE)
 #'} 
 #'\dontshow{
 #' exp <- CSTools::lonlat_temp_st$exp
diff --git a/R/as.s2dv_cube.R b/R/as.s2dv_cube.R
index f81766ecdf376b340094ab19ceeaa2fa54b2cb5c..c504fbcc69ed170e96be0c510830d163712986ff 100644
--- a/R/as.s2dv_cube.R
+++ b/R/as.s2dv_cube.R
@@ -350,9 +350,14 @@ as.s2dv_cube <- function(object, remove_attrs_coords = FALSE,
     ## load_parameters
     result$attrs$load_parameters <- attributes(object)$FileSelectors
     class(result) <- 's2dv_cube'
+  } else if (inherits(object, 'startR_cube')) {
+    stop("Unsupported object class: 'startR_cube'. ",
+         "When using startR::Start() or CSTools::CST_Start(), set ",
+         "'retrieve = TRUE' to ensure the data is retrieved into ",
+         "memory and can be converted into a 's2dv_cube' object.")
   } else {
     stop("The class of parameter 'object' is not implemented",
          " to be converted into 's2dv_cube' class yet.")
   }
   return(result)
-}
\ No newline at end of file
+}