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java.lang.NoClassDefFoundError at net.jforum.C3P0PooledConnection.init

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I have install it many times, it the same problem.
It seems can install well, but when i open the first pages, (http://www.loveworldfriend.com/JForum-2.1.6/forums/list.page)
there is error:
at net.jforum.C3P0PooledConnection.init(C3P0PooledConnection.java:64)
at net.jforum.ForumStartup.startDatabase(ForumStartup.java:75)
at net.jforum.JForum.init(JForum.java:93)
at com.caucho.server.http.Application.createServlet(Application.java:3114)
at com.caucho.server.http.Application.loadServlet(Application.java:3065)
at com.caucho.server.http.QServletConfig.loadServlet(QServletConfig.java:435)
at com.caucho.server.http.Application.getFilterChainServlet(Application.java:2809)
at com.caucho.server.http.Application.buildFilterChain(Application.java:2765)
at com.caucho.server.http.Invocation.service(Invocation.java:313)
at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
at com.caucho.server.http.RunnerRequest.handleRequest(RunnerRequest.java:346)
at com.caucho.server.http.RunnerRequest.handleConnection(RunnerRequest.java:274)
at com.caucho.server.TcpConnection.run(TcpConnection.java:139)
at java.lang.Thread.run(Thread.java:595)-----------------------------------------------------
BUT, I can install it in my pc, and couldn't run well on host.
(Resin + Mysql)
what's wrong there?

[originally posted on jforum.net by kevin]
Migrated From Jforum.net
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you are probably missing a jar file somewhere, run the code in Eclipse and check to see if you have any compilation errors in your imports.
[originally posted on jforum.net by bubblare]
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