diff --git a/distribution/ReleaseNotes.txt b/distribution/ReleaseNotes.txt
index 1c2eb0846..d577c8b98 100644
--- a/distribution/ReleaseNotes.txt
+++ b/distribution/ReleaseNotes.txt
@@ -1,8 +1,8 @@
 Release Notes
 
 planned as v0.13
-- In case of oscillations almost all effected components are shown.
-- If an error occurs, the name of the affected file is shown.
+- In case of oscillations almost all affected components are shown.
+- If an error occurs, the name of the affected circuit file is shown.
 
 v0.12.1, released on 05. Jun 2016
 - added a fuse to simulate a PROM or PAL.
diff --git a/src/main/java/de/neemann/digital/core/ExceptionWithOrigin.java b/src/main/java/de/neemann/digital/core/ExceptionWithOrigin.java
index c69296fbb..48ca34316 100644
--- a/src/main/java/de/neemann/digital/core/ExceptionWithOrigin.java
+++ b/src/main/java/de/neemann/digital/core/ExceptionWithOrigin.java
@@ -1,13 +1,15 @@
 package de.neemann.digital.core;
 
 import java.io.File;
+import java.util.HashSet;
+import java.util.Set;
 
 /**
- * A exception which has a file as an origin
+ * A exception which has a set of files as an origin.
  * Created by hneemann on 16.06.17.
  */
 public class ExceptionWithOrigin extends Exception {
-    private File origin;
+    private Set<File> origin;
 
     /**
      * Creates a new exception
@@ -40,17 +42,46 @@ public class ExceptionWithOrigin extends Exception {
     /**
      * @return the origin of the error
      */
-    public File getOrigin() {
+    public Set<File> getOrigin() {
         return origin;
     }
 
+    /**
+     * @return the origin of the error as a string
+     */
+    public String getOriginStr() {
+        Set<File> orig = getOrigin();
+        if (orig == null || orig.isEmpty())
+            return null;
+
+        StringBuilder sb = new StringBuilder();
+        for (File o : orig) {
+            if (sb.length() > 0) sb.append(", ");
+            sb.append(o.getName());
+        }
+        return sb.toString();
+    }
+
     /**
      * Sets the origin of an error
      *
-     * @param origin the file which causes the exception
+     * @param origin the file which had caused the exception
      */
     public void setOrigin(File origin) {
+        if (getOrigin() == null) {
+            this.origin = new HashSet<>();
+            this.origin.add(origin);
+        }
+    }
+
+    /**
+     * Sets the origin of an error
+     *
+     * @param origin a set of file which had caused the exception
+     */
+    public void setOrigin(Set<File> origin) {
         if (getOrigin() == null)
             this.origin = origin;
     }
+
 }
diff --git a/src/main/java/de/neemann/digital/core/NodeException.java b/src/main/java/de/neemann/digital/core/NodeException.java
index 67c49471f..b491c3d47 100644
--- a/src/main/java/de/neemann/digital/core/NodeException.java
+++ b/src/main/java/de/neemann/digital/core/NodeException.java
@@ -3,11 +3,11 @@ package de.neemann.digital.core;
 import de.neemann.digital.core.element.ElementTypeDescription;
 import de.neemann.digital.core.element.ImmutableList;
 import de.neemann.digital.core.element.PinDescription;
+import de.neemann.digital.lang.Lang;
 
 import java.io.File;
 import java.lang.reflect.Field;
-import java.util.ArrayList;
-import java.util.Collection;
+import java.util.*;
 
 /**
  * This exception is thrown if there was a problem creating or running the model.
@@ -121,41 +121,72 @@ public class NodeException extends ExceptionWithOrigin {
     }
 
     private final static class ItemConcatenation {
-        private final StringBuilder sb;
-        private boolean open;
+        private final String message;
+        private final HashMap<String, Item> items;
 
         private ItemConcatenation(String message) {
-            this.sb = new StringBuilder(message);
-            open = false;
+            this.message = message;
+            items = new HashMap<>();
         }
 
         private void addItem(String item) {
-            if (open)
-                sb.append(", ");
-            else {
-                sb.append(" (");
-                open = true;
-            }
-            sb.append(item);
+            Item it = items.computeIfAbsent(item, Item::new);
+            it.incUsage();
         }
 
         @Override
         public String toString() {
-            if (open)
-                sb.append(")");
-            return sb.toString();
+            if (items.isEmpty())
+                return message;
+
+            StringBuilder sb = new StringBuilder();
+            boolean first = true;
+            for (Item e : items.values()) {
+                if (first)
+                    first = false;
+                else
+                    sb.append(", ");
+                sb.append(e);
+            }
+
+            return message + "\n" + Lang.get("msg_affectedComponentsAre_N", sb.toString());
+        }
+    }
+
+    private final static class Item {
+        private final String item;
+        private int usage;
+
+        private Item(String item) {
+            this.item = item;
+        }
+
+        private void incUsage() {
+            usage++;
+        }
+
+        @Override
+        public String toString() {
+            if (usage == 1)
+                return item;
+            else
+                return usage + "*" + item;
         }
     }
 
     @Override
-    public File getOrigin() {
-        File o = super.getOrigin();
+    public Set<File> getOrigin() {
+        Set<File> o = super.getOrigin();
         if (o != null)
             return o;
 
+        HashSet<File> originSet = null;
         for (Node n : nodes)
-            if (n.getOrigin() != null)
-                return n.getOrigin();
-        return null;
+            if (n.getOrigin() != null) {
+                if (originSet == null) originSet = new HashSet<>();
+                originSet.add(n.getOrigin());
+            }
+        return originSet;
     }
+
 }
diff --git a/src/main/java/de/neemann/gui/ErrorMessage.java b/src/main/java/de/neemann/gui/ErrorMessage.java
index 108aa8251..9b05d1765 100644
--- a/src/main/java/de/neemann/gui/ErrorMessage.java
+++ b/src/main/java/de/neemann/gui/ErrorMessage.java
@@ -5,7 +5,6 @@ import de.neemann.digital.lang.Lang;
 
 import javax.swing.*;
 import java.awt.*;
-import java.io.File;
 
 /**
  * Used to show error messages.
@@ -47,12 +46,11 @@ public class ErrorMessage implements Runnable {
             message.append('\n');
         addExceptionMessage(e);
 
-        if (e instanceof ExceptionWithOrigin)  {
-            File o = ((ExceptionWithOrigin) e).getOrigin();
-            if (o!=null) {
-                if (message.length() > 0)
-                    message.append('\n');
-                message.append(Lang.get("msg_errInFile_N", o.getName()));
+        if (e instanceof ExceptionWithOrigin) {
+            String orig = ((ExceptionWithOrigin) e).getOriginStr();
+            if (orig != null) {
+                if (message.length() > 0) message.append('\n');
+                message.append(Lang.get("msg_errInFile_N", orig));
             }
         }
 
diff --git a/src/main/resources/lang/lang_de.xml b/src/main/resources/lang/lang_de.xml
index d4c283aef..652194712 100644
--- a/src/main/resources/lang/lang_de.xml
+++ b/src/main/resources/lang/lang_de.xml
@@ -121,7 +121,7 @@ Es kann dann ein Programm bis zum nächsten BRK-Befehl ausgeführt werden.</stri
     <string name="elem_Counter_pin_clr">Setzt den Zähler auf 0 zurück wenn dieser Eingang auf 1 gesetzt wird.</string>
     <string name="elem_Counter_pin_ovf">Overflow Ausgang. Hat der Zähler das Maximum erreicht, wird dieser Ausgang für eine Taktdauer 1.</string>
     <string name="elem_Counter_pin_out">Gibt den gezählten Wert aus.</string>
-    <string name="elem_D_FF">D-FlipFLop</string>
+    <string name="elem_D_FF">D-FlipFlop</string>
     <string name="elem_D_FF_short">D</string>
     <string name="elem_D_FF_tt">Ein Baustein zum Speichern eines Bits. Der an Eingang D anliegende Wert wird abgespeichert wenn Eingang C auf 1 wechselt.</string>
     <string name="elem_D_FF_pin_D">Das zu speichernde Bit.</string>
@@ -185,7 +185,7 @@ Es können sowohl komplette Takte als auch einzelne Gatter-Veränderungen angeze
     <string name="elem_JK_FF_AS_pin_Set">asynchrones setzen</string>
     <string name="elem_JK_FF_AS_pin_Clr">asynchrones löschen</string>
 
-    <string name="elem_D_FF_AS">D-FlipFLop, asynchron</string>
+    <string name="elem_D_FF_AS">D-FlipFlop, asynchron</string>
     <string name="elem_D_FF_AS_short">D-AS</string>
     <string name="elem_D_FF_AS_tt">Ein Baustein zum Speichern eines Bits. Der an Eingang D anliegende Wert wird abgespeichert wenn Eingang C auf 1 wechselt.</string>
     <string name="elem_D_FF_AS_pin_D">Das zu speichernde Bit.</string>
@@ -914,7 +914,8 @@ Die Icons stammen aus dem Tango Desktop Project.</string>
     <string name="msg_inputsToInvert">Zu invertierende Eingänge</string>
     <string name="msg_none">keine</string>
     <string name="msg_errGettingPinNames">Die Namen der Pins konnten nicht ermittelt werden.</string>
-    <string name="msg_errInFile_N">Aufgetreten in Datei {0}!</string>
+    <string name="msg_errInFile_N">Aufgetreten in Datei {0}.</string>
+    <string name="msg_affectedComponentsAre_N">Betroffen sind: {0}.</string>
 
     <string name="ok">Ok</string>
     <string name="rot_0">0°</string>
diff --git a/src/main/resources/lang/lang_en.xml b/src/main/resources/lang/lang_en.xml
index 7c211b1b5..d09fe47c3 100644
--- a/src/main/resources/lang/lang_en.xml
+++ b/src/main/resources/lang/lang_en.xml
@@ -901,7 +901,8 @@ The icons are taken from the Tango Desktop Project.</string>
     <string name="msg_inputsToInvert">Inputs to invert</string>
     <string name="msg_none">none</string>
     <string name="msg_errGettingPinNames">Could not determine the names of the pins.</string>
-    <string name="msg_errInFile_N">Occurred in file {0}!</string>
+    <string name="msg_errInFile_N">Occurred in file {0}.</string>
+    <string name="msg_affectedComponentsAre_N">Affected are: {0}.</string>
 
     <string name="ok">Ok</string>
     <string name="rot_0">0°</string>