Add the error template.
diff --git a/asterix-app/src/main/resources/webui/errortemplate.html b/asterix-app/src/main/resources/webui/errortemplate.html
new file mode 100644
index 0000000..8c39e03
--- /dev/null
+++ b/asterix-app/src/main/resources/webui/errortemplate.html
@@ -0,0 +1,38 @@
+<div class="accordion" id="errorblock">
+  <div class="accordion-group">
+    <div class="accordion-heading">
+      <a class="accordion-toggle" data-toggle="collapse" data-parent="#errorblock" href="#levelOne">
+        Message
+      </a>
+    </div>
+    <div id="levelOne" class="accordion-body collapse in">
+      <div class="accordion-inner">
+        <pre class="error">%s</pre>
+      </div>
+    </div>
+  </div>
+  <div class="accordion-group">
+    <div class="accordion-heading">
+      <a class="accordion-toggle" data-toggle="collapse" data-parent="#errorblock" href="#levelTwo">
+        Summary
+      </a>
+    </div>
+    <div id="levelTwo" class="accordion-body collapse">
+      <div class="accordion-inner">
+        <pre class="error">%s</pre>
+      </div>
+    </div>
+  </div>
+  <div class="accordion-group">
+    <div class="accordion-heading">
+      <a class="accordion-toggle" data-toggle="collapse" data-parent="#errorblock" href="#levelThree">
+        Full Stack Trace
+      </a>
+    </div>
+    <div id="levelThree" class="accordion-body collapse">
+      <div class="accordion-inner">
+        <pre class="error">%s</pre>
+      </div>
+    </div>
+  </div>
+</div>