diff --git a/core/views/expo.py b/core/views/expo.py
index 6c79771..8b3e27e 100644
--- a/core/views/expo.py
+++ b/core/views/expo.py
@@ -318,12 +318,17 @@ def editexpopage(request, path):
                     # see also core/models/cave.py writetrogglefile()
                     f.write(result)
                     # should replace .call with .run and capture_output=True
-                    subprocess.call([git, "add", filename], cwd=cwd)
-                    subprocess.call([git, "commit", "-m", 'Edit this page'], cwd=cwd)
             except PermissionError:
                 message = f'CANNOT  save this file.\nPERMISSIONS incorrectly set on server for this file {filename}. Ask a nerd to fix this.'
                 return render(request,'errors/generic.html', {'message': message})
-            except SubprocessError:
+
+            try:
+                cp1 = subprocess.run([git, "add", filename], cwd=cwd, capture_output=True)
+                cp2 = subprocess.run([git, "commit", "-m", 'Edit this page'], cwd=cwd, capture_output=True)
+                message = f'Test output this file {filename}. git command output.\n' + str(cp1) + '\n\n' + str(cp2)
+                return render(request,'errors/debug.html', {'message': message})
+
+            except subprocess.SubprocessError:
                 message = f'CANNOT git on server for this file {filename}. Edits not saved.\nAsk a nerd to fix this.'
                 return render(request,'errors/generic.html', {'message': message})
  
diff --git a/templates/errors/debug.html b/templates/errors/debug.html
new file mode 100644
index 0000000..c2cc025
--- /dev/null
+++ b/templates/errors/debug.html
@@ -0,0 +1,50 @@
+{% extends 'base.html' %}
+
+{% block title %}Troggle Debug - Generic page{% endblock %}
+{% block content %}
+
+<div class='middle'>
+	<h2>Troggle Debug Page</h2>
+</div>
+
+    
+<div   class='middle3 login'>
+	<div class='space'></div>
+	<div class='align-center'>
+		<h3>This is temporary debugging output. There has NOT been an error.</h3>
+        <h4>
+        
+        <font color="red">
+        {% if message %}
+        <pre>
+            {{message}}
+        </pre>
+        {% else %}
+            <p>Placeholder. </p>
+        
+        {% endif %}
+        </font>
+        </h4>
+	<div class='space'><p>&nbsp;</div>
+        
+		<h3>What you should do now</h3>
+    <p>Please report this by emailing the nerds at 
+        <a href="mailto:expo-tech@lists.wookware.org">expo-tech@lists.wookware.org</a> with this information:
+        <ol>
+        <li>The message written in <font color="red">red</font> above.
+        <li>The previous page URL: <font color="red">
+<script type="text/javascript">
+    document.write(document.referrer);
+</script></font>
+        <li>Go back to this previous page <script type="text/javascript">
+        document.write("<a href='",document.referrer,"'>",document.referrer,"</a>");
+        </script>
+        and see if you can tell whether the page causing the debug output was in HTML text which had been written manually, or whether it appeared to be a programming intention.
+        </ol>
+
+
+	</div>
+</div>
+</div>
+
+{% endblock %}
\ No newline at end of file