hello i have uploaded a rather large dataset and am currently getting the following message. any details could be helpful.

500: Unexpected server error

org.labkey.experiment.api.ExpObjectImpl

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java.lang.NoClassDefFoundError: org.labkey.experiment.api.ExpObjectImpl
       at org.labkey.experiment.api.ExperimentServiceImpl.getExpProtocol(ExperimentServiceImpl.java:561)
       at org.labkey.experiment.api.ExperimentServiceImpl.getExpProtocol(ExperimentServiceImpl.java:67)
       at org.labkey.api.study.actions.BaseAssayAction.getProtocol(BaseAssayAction.java:73)
       at org.labkey.api.study.actions.ProtocolIdForm.getProtocol(ProtocolIdForm.java:61)
       at org.labkey.api.study.actions.ProtocolIdForm.getProtocol(ProtocolIdForm.java:68)
       at org.labkey.study.controllers.assay.AssayController$AssayBeginAction.getView(AssayController.java:386)
       at org.labkey.study.controllers.assay.AssayController$AssayBeginAction.getView(AssayController.java:378)
       at org.labkey.api.action.SimpleViewAction.handleRequest(SimpleViewAction.java:61)
       at org.labkey.api.action.BaseViewAction.handleRequestInternal(BaseViewAction.java:166)
       at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
       at org.labkey.api.action.SpringActionController.handleRequest(SpringActionController.java:334)
       at org.labkey.api.module.DefaultModule.dispatch(DefaultModule.java:742)
       at org.labkey.api.view.ViewServlet.service(ViewServlet.java:150)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
       at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
       at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
       at org.labkey.api.data.TransactionFilter.doFilter(TransactionFilter.java:36)
       at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
       at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
       at org.labkey.core.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:118)
       at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
       at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
       at org.labkey.api.module.ModuleLoader.doFilter(ModuleLoader.java:601)
       at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
       at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
       at org.labkey.api.security.AuthFilter.doFilter(AuthFilter.java:101)
       at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
       at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
       at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
       at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
       at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
       at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
       at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
       at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
       at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
       at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
       at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
       at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
       at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
       at java.lang.Thread.run(Unknown Source)
request attributes
LABKEY.StartTime = 1295406207378
LABKEY.container = /Private/PreClinical Studies/NHP Studies/M029
LABKEY.OriginalURL = http://odysseus.iavi.org/labkey/assay/Private/PreClinical%20Studies/NHP%20Studies/M029/assayBegin.view?rowId=286
LABKEY.action = assayBegin
org.springframework.web.servlet.DispatcherServlet.CONTEXT = org.springframework.web.context.support.XmlWebApplicationContext@b635d7: display name [Study WebApplicationContext]; startup date [Tue Jan 18 21:46:32 EST 2011]; parent: org.springframework.web.context.support.XmlWebApplicationContext@15e293a
LABKEY.controller = assay
LABKEY.RequestURL = /labkey/assay/Private/PreClinical%20Studies/NHP%20Studies/M029/assayBegin.view?rowId=286
LABKEY.OriginalURLHelper = /labkey/assay/Private/PreClinical%20Studies/NHP%20Studies/M029/assayBegin.view?rowId=286

core schema database configuration
Server URL    jdbc:jtds:sqlserver://localhost/labkeydev
Product Name    Microsoft SQL Server
Product Version    09.00.2047
Driver Name    jTDS Type 4 JDBC Driver for MS SQL Server and Sybase
Driver Version    1.2.5