diff --git a/inst/metadata/entity/entity_handler_ncdf.R b/inst/metadata/entity/entity_handler_ncdf.R
index 1701535..f5a9d54 100644
--- a/inst/metadata/entity/entity_handler_ncdf.R
+++ b/inst/metadata/entity/entity_handler_ncdf.R
@@ -5,6 +5,9 @@ handle_entities_ncdf <- function(handler, source, config, handle = TRUE){
   if(!requireNamespace("ncdf4", quietly = TRUE)){
     stop("The NCDF handler requires the 'ncdf4' package")
   }
+  if(!requireNamespace("XML", quietly = TRUE)){
+    stop("The NCDF handler requires the 'XML' package")
+  }
   
   #if(!mime::guess_type(source)=="application/x-netcdf"){
   #  errMsg <- "Error in 'handle_entities_df': source parameter should be an 'netcdf' file"
diff --git a/inst/metadata/entity/entity_handler_ncml.R b/inst/metadata/entity/entity_handler_ncml.R
index 9f989fa..5fcbf00 100644
--- a/inst/metadata/entity/entity_handler_ncml.R
+++ b/inst/metadata/entity/entity_handler_ncml.R
@@ -3,6 +3,10 @@ handle_entities_ncml <- function(handler, source, config, handle = TRUE){
   
   config$logger.info("NCML Handle")
   
+  if(!requireNamespace("XML", quietly = TRUE)){
+    stop("The NCML handler requires the 'XML' package")
+  }
+  
   getNCML <- function(file){
     
     xml <- XML::xmlParse(httr::content(httr::GET(file),"text"))
diff --git a/inst/metadata/entity/entity_handler_thredds.R b/inst/metadata/entity/entity_handler_thredds.R
index 31a508f..ac03707 100644
--- a/inst/metadata/entity/entity_handler_thredds.R
+++ b/inst/metadata/entity/entity_handler_thredds.R
@@ -5,7 +5,10 @@ handle_entities_thredds <- function(handler, source, config){
     stop("The Thredds handler requires the 'thredds' package")
   }
   if(!requireNamespace("ncdf4", quietly = TRUE)){
-    stop("The NCDF handler requires the 'ncdf4' package")
+    stop("The Thredds handler requires the 'ncdf4' package")
+  }
+  if(!requireNamespace("XML", quietly = TRUE)){
+    stop("The Thredds handler requires the 'XML' package")
   }
   
   thredds <- config$software$input$thredds