acts_as_solr plugin not working properly in rails postgresql


I have implement books search application in ruby on rails with solr server search.

I am using rails 2.3.2 , postgresql-8.3.11 in CentOS and acts_as_solr plugin. I followed the instruction on site URL below:

When I run rake solr:start I am getting error as

Exception in thread "main" java.lang.NoClassDefFoundError: RadRails Caused by: java.lang.ClassNotFoundException: RadRails         at$         at Method)         at         at java.lang.ClassLoader.loadClass(         at sun.misc.Launcher$AppClassLoader.loadClass(         at java.lang.ClassLoader.loadClass(         at java.lang.ClassLoader.loadClassInternal( Could not find the main class: RadRails. Program will exit.

Kindly help me to solve and run the simple application using apache solr. Thanx in advance.