udpate instruciton for evaluation

code.html

@@ -136,7 +136,7 @@ <h2>
 <!--						</li>-->
 					</ul>
 				</p>
-		
+
 
 <!--			</div>-->
 <!--		</div>-->

evaluation.html

@@ -119,8 +119,15 @@ <h2>Note</h2>
 											We are mataining the server now. The evaluation server is not available now. For evaluation, please send email to [email protected] during maintenance.
 											</strong>
 									</li> -->
+						<li>
+							Empty files are a frequent source of evaluation errors. Please make sure that no file corresponding to any class is left empty.
+							In other words, ensure that every class has at least one prediction.
+						</li>
 					</ul>
 				</p>
+<!--				<h2>Comman problems </h2>-->
+<!--				<p>-->
+<!--				</p>-->
 
 				<h2>
 					DOTA-v1.0 Server

index.html

@@ -275,6 +275,10 @@ <h3>
 
 <script type='text/javascript' id='clustrmaps' src='//cdn.clustrmaps.com/map_v2.js?cl=ffffff&w=300&t=tt&d=Vs7kEm-F-yc_I1yR89KMrjHwPuM3LWsU-RKxnqEQh3s'></script>
 
+<!--		<div align="center">-->
+<!--<a href="http://www.amazingcounters.com"><img border="0" src="http://cc.amazingcounters.com/counter.php?i=3220030&c=9660403" alt="AmazingCounters.com"></a>-->
+<!--</div>-->
+
 		<br>
 	</div>