diff --git a/src/main/java/de/maishai/Compiler.java b/src/main/java/de/maishai/Compiler.java
index 79e5355..749afb5 100644
--- a/src/main/java/de/maishai/Compiler.java
+++ b/src/main/java/de/maishai/Compiler.java
@@ -25,9 +25,19 @@ public class Compiler {
         List<Class> classes = new ArrayList<>();
         for (String fromSource : fromSources) {
             CharStream input = CharStreams.fromString(fromSource);
+
             DecafLexer lexer = new DecafLexer(input);
+            //add custom error listener
+            lexer.removeErrorListeners();
+            lexer.addErrorListener(ThrowingErrorListener.INSTANCE);
+
             CommonTokenStream tokens = new CommonTokenStream(lexer);
+
             DecafParser parser = new DecafParser(tokens);
+            //add custom error listener
+            parser.removeErrorListeners();
+            parser.addErrorListener(ThrowingErrorListener.INSTANCE);
+
             DecafParser.ClassContext tree = parser.class_(); //Parsen
             classes.add(ASTGenerator.generateAST(tree));
         }
diff --git a/src/main/java/de/maishai/ThrowingErrorListener.java b/src/main/java/de/maishai/ThrowingErrorListener.java
new file mode 100644
index 0000000..7cbbdee
--- /dev/null
+++ b/src/main/java/de/maishai/ThrowingErrorListener.java
@@ -0,0 +1,17 @@
+package de.maishai;
+
+import org.antlr.v4.runtime.BaseErrorListener;
+import org.antlr.v4.runtime.RecognitionException;
+import org.antlr.v4.runtime.Recognizer;
+import org.antlr.v4.runtime.misc.ParseCancellationException;
+
+public class ThrowingErrorListener extends BaseErrorListener {
+
+    public static final ThrowingErrorListener INSTANCE = new ThrowingErrorListener();
+
+    @Override
+    public void syntaxError(Recognizer<?, ?> recognizer, Object offendingSymbol, int line, int charPositionInLine, String msg, RecognitionException e)
+            throws ParseCancellationException {
+        throw new ParseCancellationException("Error in line " + line + ":" + charPositionInLine + " " + msg);
+    }
+}