try to add sample config. I shouldn't have permission

conf/autoload_configs/mongo.conf.xml

+<configuration name="mongo.conf">
+  <settings>
+    <param name="host" value="127.0.0.1:27017"/>
+    <param name="min-connections" value="10"/>
+    <param name="max-connections" value="100"/>
+  </settings>
+</configuration>