diff --git a/sources/zweic/Report.scala b/sources/zweic/Report.scala
new file mode 100755
index 0000000..895769d
--- /dev/null
+++ b/sources/zweic/Report.scala
@@ -0,0 +1,51 @@
+/*  zweic -- a compiler for zwei
+ *
+ *  Stephane Micheloud & LAMP
+ *
+ *  $Id$
+ */
+
+package zweic;
+
+
+/** This class provides functionality for printing error messages.
+ */
+object Report {
+
+  /** Number of errors.
+   */
+  var errors: Int = 0;
+
+  /** Prints out an error message.
+   */
+  def error(message: String): Unit = {
+    errors = errors + 1;
+    System.err.println(message);
+  }
+
+  /** Prints out an error message.
+   */
+  def error(position: Int, message: String): Unit = {
+    errors = errors + 1;
+    print(position, message);
+  }
+
+  /** Prints out an error message and stops the program execution.
+   */
+  def fail(message: String): Unit = {
+    error(message);
+    System.exit(-1);
+  }
+
+  /** Prints out an error message and stops the program execution.
+   */
+  def fail(position: Int, message: String): Unit = {
+    error(position, message);
+    System.exit(-1);
+  }
+
+  /** Imprime la position et le message passés en argument. */
+  private def print(pos: Int, message: String): Unit =
+    System.err.println(Position.toString(pos) + ": " + message);
+
+}