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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, (
there is error:
at net.jforum.C3P0PooledConnection.init(
at net.jforum.ForumStartup.startDatabase(
at net.jforum.JForum.init(
at com.caucho.server.http.Application.createServlet(
at com.caucho.server.http.Application.loadServlet(
at com.caucho.server.http.QServletConfig.loadServlet(
at com.caucho.server.http.Application.getFilterChainServlet(
at com.caucho.server.http.Application.buildFilterChain(
at com.caucho.server.http.Invocation.service(
at com.caucho.server.http.CacheInvocation.service(
at com.caucho.server.http.RunnerRequest.handleRequest(
at com.caucho.server.http.RunnerRequest.handleConnection(
BUT, I can install it in my pc, and couldn't run well on host.
(Resin + Mysql)
what's wrong there?

[originally posted on by kevin]
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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 by bubblare]
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