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Reply:[Users] compile source code has debug

hi,all:
PLEASE HELP!!!!!!when i download the source code and compile it,when i run it ,it appears the debug as following:
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
java.lang.NullPointerException
org.akaza.openclinica.dao.login.UserAccountDAO.findByUserName(UserAccountDAO.java:500)
org.akaza.openclinica.web.filter.OpenClinicaAuthenticationProcessingFilter.attemptAuthentication(OpenClinicaAuthenticationProcessingFilter.java:106)
org.springframework.security.ui.AbstractProcessingFilter.doFilterHttp(AbstractProcessingFilter.java:258)
org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
org.springframework.security.ui.logout.LogoutFilter.doFilterHttp(LogoutFilter.java:89)
org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
org.springframework.security.context.HttpSessionContextIntegrationFilter.doFilterHttp(HttpSessionContextIntegrationFilter.java:235)
org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
org.springframework.security.util.FilterChainProxy.doFilter(FilterChainProxy.java:175)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:236)
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.26 logs.
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