Profiling umbraco backend not working

Hi,

In one of my project , i used miniprofiler for debugging. I have followed instruction specified in http://jlusar.es/miniprofiler-for-umbraco.

But Profiling umbraco backend not working. When i added the code “<profiler:Renderer Position=“Right” runat=“server” />” it shows error unrecognized tag prefix ‘profiler’.

Please help me to resolve it.

I have used Umbraco v4.7.1 , asp.net 4 & sql server 2008 ,iis7