diff --git a/src/main/groovy/qupath/ext/basicstitching/functions/StitchingGUI.groovy b/src/main/groovy/qupath/ext/basicstitching/functions/StitchingGUI.groovy
index 45963a1..0a2273c 100644
--- a/src/main/groovy/qupath/ext/basicstitching/functions/StitchingGUI.groovy
+++ b/src/main/groovy/qupath/ext/basicstitching/functions/StitchingGUI.groovy
@@ -408,5 +408,17 @@ class StitchingGUI {
         }
     }
 
+    static void showAlertDialog(String message) {
+        Alert alert = new Alert(Alert.AlertType.WARNING)
+        alert.setTitle("Warning!")
+        alert.setHeaderText(null)
+        alert.setContentText(message)
+
+        // This line makes the alert a modal dialog
+        alert.initModality(Modality.APPLICATION_MODAL)
+
+        alert.showAndWait()
+    }
+
 
 }
diff --git a/src/main/groovy/qupath/ext/basicstitching/stitching/StitchingImplementations.groovy b/src/main/groovy/qupath/ext/basicstitching/stitching/StitchingImplementations.groovy
index c0454bd..067bc76 100644
--- a/src/main/groovy/qupath/ext/basicstitching/stitching/StitchingImplementations.groovy
+++ b/src/main/groovy/qupath/ext/basicstitching/stitching/StitchingImplementations.groovy
@@ -1,10 +1,10 @@
 package qupath.ext.basicstitching.stitching
 
 import org.slf4j.LoggerFactory
+import qupath.ext.basicstitching.functions.StitchingGUI
 import qupath.ext.basicstitching.utilities.UtilityFunctions
 import qupath.lib.common.GeneralTools
 import qupath.lib.gui.QuPathGUI
-import qupath.lib.gui.dialogs.Dialogs
 import qupath.lib.images.servers.ImageServerProvider
 import qupath.lib.images.servers.ImageServers
 import qupath.lib.images.servers.SparseImageServer
@@ -598,7 +598,7 @@ class StitchingImplementations {
                 setStitchingStrategy(new TileConfigurationTxtStrategy())
                 break
             default:
-                Dialogs.showWarningNotification("Warning", "Error with choosing a stitching method, code here should not be reached in StitchingImplementations.groovy")
+                StitchingGUI.showAlertDialog("Error with choosing a stitching method, code here should not be reached in StitchingImplementations.groovy")
                 return // Safely exit the method if the stitching type is not recognized
         }
 
@@ -611,7 +611,7 @@ class StitchingImplementations {
 
             // Check if valid file-region pairs were obtained
             if (fileRegionPairs == null || fileRegionPairs.isEmpty()) {
-                Dialogs.showWarningNotification("Warning", "No valid folders found matching the criteria.")
+                StitchingGUI.showAlertDialog("No valid folders found matching the criteria.")
                 return // Exit the method if no valid file-region pairs are found
             }