problems with font shape and size substitutions

Hello, I am brandly new and I have  just started a document:
*\documentclass{beamer}*
*\usetheme{Warsaw}*
*\begin{document}*
* Hello*
*\end{document}*
 I can get a pdf output but the following errors appear:
*" Font shape `OT1/cmss/m/n' in size <4> not available(Font) size <5>
substituted*
*" Size substitutions with differences(Font) up to 1.0pt have occurred.*
I just want to know how they can be fixed.
Thank you so much for your help

-- 
Lei



   -
*La duda es uno de los nombres de la inteligencia. *
   -


* Only two things are infinite, the universe and human stupidity, and I'm
   not sure about the former. *
   -
*Quand la verité n'est pas libre, la liberté n'est pas vraie. *
   - *Da weiß man, was man hat.*
------------------------------------------------------------------------------
One dashboard for servers and applications across Physical-Virtual-Cloud 
Widest out-of-the-box monitoring support with 50+ applications
Performance metrics, stats and reports that give you Actionable Insights
Deep dive visibility with transaction tracing using APM Insight.
http://ad.doubleclick.net/ddm/clk/290420510;117567292;y
_______________________________________________
MiKTeX-Users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/miktex-users