diff --git a/src/sic/asm/ErrorCatcher.java b/src/sic/asm/ErrorCatcher.java
index 09e645c..ba13be9 100644
--- a/src/sic/asm/ErrorCatcher.java
+++ b/src/sic/asm/ErrorCatcher.java
@@ -39,11 +39,14 @@ public void printByRow(int row) {
                 System.err.println(err);
     }
 
-    public void print() {
+    public String print() {
+	String allErrs="";
         for ( ; lastPrinted < errs.size(); lastPrinted++) {
             AsmError err = errs.get(lastPrinted);
             System.err.println(err);
+	    allErrs+=(err+"\n");
         }
+	return allErrs;
     }
 
     public boolean shouldEnd() {
diff --git a/src/sic/sim/MainView.java b/src/sic/sim/MainView.java
index a1a6bc0..64311ac 100644
--- a/src/sic/sim/MainView.java
+++ b/src/sic/sim/MainView.java
@@ -331,7 +331,14 @@ public void loadAsm(File file) {
         ErrorCatcher errorCatcher = assembler.errorCatcher;
         Program program = assembler.assemble(Utils.readFile(file));
         if (errorCatcher.count() > 0) {
-            errorCatcher.print();
+            String allErrs = errorCatcher.print();
+	    JTextArea errArea = new JTextArea(allErrs);
+            JScrollPane scrollPane = new JScrollPane(errArea);
+            errArea.setLineWrap(true);
+            errArea.setWrapStyleWord(true);
+            scrollPane.setPreferredSize(new Dimension( 250, 250 ));
+            JOptionPane.showMessageDialog(mainFrame, scrollPane, "Error", JOptionPane.INFORMATION_MESSAGE);
+            updateView();
             if (errorCatcher.shouldEnd()) {
                 return;
             }