diff --git a/src/main/java/de/neemann/digital/testing/TestData.java b/src/main/java/de/neemann/digital/testing/TestData.java
index a790e2f6e..564f4cf3f 100644
--- a/src/main/java/de/neemann/digital/testing/TestData.java
+++ b/src/main/java/de/neemann/digital/testing/TestData.java
@@ -1,5 +1,6 @@
 package de.neemann.digital.testing;
 
+import de.neemann.digital.lang.Lang;
 import de.neemann.digital.testing.parser.LineEmitter;
 import de.neemann.digital.testing.parser.Parser;
 import de.neemann.digital.testing.parser.ParserException;
@@ -66,7 +67,7 @@ public class TestData {
                 lines = tdp.getLines();
                 names = tdp.getNames();
             } catch (ParserException | IOException e) {
-                throw new TestingDataException(e);
+                throw new TestingDataException(Lang.get("err_errorParsingTestdata"), e);
             }
         }
     }
diff --git a/src/main/java/de/neemann/digital/testing/TestResult.java b/src/main/java/de/neemann/digital/testing/TestResult.java
index 6cb370a5a..8ed3e1e9a 100644
--- a/src/main/java/de/neemann/digital/testing/TestResult.java
+++ b/src/main/java/de/neemann/digital/testing/TestResult.java
@@ -96,7 +96,7 @@ public class TestResult {
         try {
             lines.emitLines(new LineListenerResolveDontCare(values -> checkRow(model, values), inputs), new Context());
         } catch (ParserException e) {
-            throw new TestingDataException(e);
+            throw new TestingDataException(Lang.get("err_errorParsingTestdata"), e);
         } catch (RuntimeException e) {
             if (allPassed) {
                 allPassed = false;
diff --git a/src/main/java/de/neemann/digital/testing/TestingDataException.java b/src/main/java/de/neemann/digital/testing/TestingDataException.java
index db24f5f1e..ad1558960 100644
--- a/src/main/java/de/neemann/digital/testing/TestingDataException.java
+++ b/src/main/java/de/neemann/digital/testing/TestingDataException.java
@@ -7,10 +7,11 @@ public class TestingDataException extends Exception {
     /**
      * creates a new instance
      *
-     * @param cause the cause
+     * @param message the error message
+     * @param cause   the cause
      */
-    public TestingDataException(Exception cause) {
-        super(cause);
+    public TestingDataException(String message, Exception cause) {
+        super(message, cause);
     }
 
     /**
diff --git a/src/main/java/de/neemann/gui/ErrorMessage.java b/src/main/java/de/neemann/gui/ErrorMessage.java
index f1cdb7d9f..b396c2816 100644
--- a/src/main/java/de/neemann/gui/ErrorMessage.java
+++ b/src/main/java/de/neemann/gui/ErrorMessage.java
@@ -61,7 +61,7 @@ public class ErrorMessage implements Runnable {
                 message.append(e.getClass().getSimpleName());
             e = e.getCause();
             if (e != null)
-                message.append("\ncaused by: ");
+                message.append("\n").append(Lang.get("msg_errCausedBy")).append(": ");
         }
     }
 
diff --git a/src/main/resources/lang/lang_de.xml b/src/main/resources/lang/lang_de.xml
index d553afbee..4698ec2c0 100644
--- a/src/main/resources/lang/lang_de.xml
+++ b/src/main/resources/lang/lang_de.xml
@@ -529,6 +529,7 @@ Sind evtl. die Namen der Variablen nicht eindeutig?</string>
     <string name="err_MultiBitFlipFlopFound">Es sind keine Flipflops mit mehr als einem Bit erlaubt!</string>
     <string name="err_invalidTransmissionGateState">Die Steuereingänge eines Transmission-Gates müssen invertiert beschaltet werden!</string>
     <string name="err_nameUsedTwice_N">Signal {0} wurde mehrfach verwendet!</string>
+    <string name="err_errorParsingTestdata">Fehler beim Einlesen der Testdaten.</string>
 
     <string name="key_AddrBits">Adress-Bits</string>
     <string name="key_AddrBits_tt">Anzahl der Adress-Bits die verwendet werden.</string>
@@ -865,6 +866,7 @@ Die Icons stammen aus dem Tango Desktop Project.</string>
     <string name="btn_gifComplete">Fertig</string>
     <string name="btn_gifComplete_tt">Die GIF-Datei wird abgeschlossen.</string>
     <string name="msg_gifExport">GIF-Export</string>
+    <string name="msg_errCausedBy">verursacht durch</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 a830fa2f2..d553fe45f 100644
--- a/src/main/resources/lang/lang_en.xml
+++ b/src/main/resources/lang/lang_en.xml
@@ -519,6 +519,7 @@ The names of the variables may not be unique.</string>
     <string name="err_MultiBitFlipFlopFound">Flipflops with more then one bits are not allowed!</string>
     <string name="err_invalidTransmissionGateState">The two control inputs of a transmission gate must be inverted!</string>
     <string name="err_nameUsedTwice_N">Signal {0} is used twice!</string>
+    <string name="err_errorParsingTestdata">Error parsing the test data.</string>
 
     <string name="key_AddrBits">Address Bits</string>
     <string name="key_AddrBits_tt">Number of address bits used.</string>
@@ -853,6 +854,7 @@ The icons are taken from the Tango Desktop Project.</string>
     <string name="btn_gifComplete">Ready</string>
     <string name="btn_gifComplete_tt">The GIF file is finalized and closed.</string>
     <string name="msg_gifExport">GIF Export</string>
+    <string name="msg_errCausedBy">caused by</string>
 
     <string name="ok">Ok</string>
     <string name="rot_0">0°</string>