diff --git a/NAMESPACE b/NAMESPACE
index deb945ef..1dca5501 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -104,6 +104,7 @@ importFrom(plyr,llply)
 importFrom(purrr,quietly)
 importFrom(shiny,getDefaultReactiveDomain)
 importFrom(shiny,incProgress)
+importFrom(shiny,isRunning)
 importFrom(shiny,withProgress)
 importFrom(stats,as.formula)
 importFrom(stats,setNames)
diff --git a/NEWS.md b/NEWS.md
index dcf848b0..1db4edae 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -12,7 +12,7 @@ NEW FEATURES:
 It contains a table with group dimensions of time series for binding constraints.
 * `readAntares()` new parameter **clustersST** to read (output simulation) short-term clusters
 * New function `readAntaresSTClusters()`
-
+* `fread_antares()` shiny compatible with a conditional processing of the error messages
 
 BREAKING CHANGES :
 
@@ -25,6 +25,7 @@ BUGFIXES :
 * `readInputThermal()` return data from file data.txt with `thermalData` parameter
 * `setSimulationPath()` has also the parameter **areasWithSTClusters** in 'output' mode
 * `setSimulationPathAPI()`: control the existence of the output folder **links** or **areas** before reading the data (upgrade Antares Web)
+* `readClusterDesc()` / `readClusterResDesc()` / `readClusterSTDesc()` return a data.table in API mode
 
 
 # antaresRead 2.7.0
diff --git a/R/readClusterDesc.R b/R/readClusterDesc.R
index f9f75032..23b4fb2d 100644
--- a/R/readClusterDesc.R
+++ b/R/readClusterDesc.R
@@ -104,18 +104,17 @@ readClusterSTDesc <- function(opts = simOptions()) {
     "st-storage/clusters" =  "st-storages"
   )
   
-  if(api_study){
-    
+  if (api_study) {
     # api request with all columns
-    list_clusters = api_get(
+    list_clusters <- api_get(
       opts = opts,
       endpoint = paste0(opts$study_id, "/table-mode/", table_type),
-      query = list(
-        columns = ""
-      )
+      query = list(columns = "")
     )
     
-    return(list_clusters)
+    dt_clusters <- .convert_list_clusterDesc_to_datatable(list_clusters)
+  
+    return(dt_clusters)
   }
       
   # "text" mode
@@ -124,7 +123,7 @@ readClusterSTDesc <- function(opts = simOptions()) {
   # READ cluster properties
   properties <- get_input_cluster_properties(table_type = table_type, 
                                              opts = opts)
-  
+   
   # read properties for each area
   res <- plyr::llply(areas, function(x, prop_ref=properties) {
     clusters <- readIniFile(file.path(path, x, "list.ini"))
@@ -225,3 +224,29 @@ get_input_cluster_properties <- function(table_type, opts){
   
   return(wide_ref)
 }
+
+
+.convert_list_clusterDesc_to_datatable <- function(list_clusters) {
+  
+  if (length(list_clusters) == 0) {
+    return(data.table())
+  } 
+    
+  rows_cluster <- lapply(names(list_clusters), FUN = function(cl_name) {
+      
+      row_cluster <- as.data.frame(list_clusters[[cl_name]])
+      row_cluster[,c("area", "cluster")] <- unlist(strsplit(cl_name, split = " / "))
+      
+      return(row_cluster)
+    }
+  )
+
+  df_clusters <- do.call("rbind", rows_cluster)
+  id_cols <- intersect(c("area", "cluster", "group"), colnames(df_clusters))
+  additional_cols <- setdiff(colnames(df_clusters), id_cols)  
+  df_clusters <- df_clusters[,c(id_cols, additional_cols)]
+  df_clusters$cluster <- as.factor(tolower(df_clusters$cluster))
+  colnames(df_clusters) <- tolower(colnames(df_clusters))
+  
+  return(as.data.table(df_clusters))
+}
diff --git a/R/utils_api.R b/R/utils_api.R
index 499c7d27..370ba422 100644
--- a/R/utils_api.R
+++ b/R/utils_api.R
@@ -1,4 +1,5 @@
 #' @importFrom utils URLencode
+#' @importFrom shiny isRunning
 fread_antares <- function(opts, file, ...) {
   if (identical(opts$typeLoad, "api")) {
     file <- gsub("\\.txt$", "", file)
@@ -9,7 +10,10 @@ fread_antares <- function(opts, file, ...) {
     )
     suppressWarnings(
       tryCatch(fread(response, ...), error = function(e){
-        message(file); message(e)
+        if(isRunning())
+          e <- as.character(e)
+        message(file) 
+        message(e)
       }))
   } else {
     suppressWarnings(