Problem during starting tomcat-Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/catalina/s

[Sneha Manohar]

hi
  I have installed tomcat6.x. I have set the path of tomcat_home & java_home.
  when I start server , screen closes.I have used catalina out , I get follwing 
error
  Exception in thread "main" java.lang.NoClassDefFoundError: 
org/apache/catalina/s
tartup/Bootstrap.
   
  sneha

       
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