[opencms-dev] OpenCms login error>>> 10 Unknown User.

[Patcha Inc. Leart.]

Please Help!!!
        At the first time i can login to OpenCms with
Username :Admin
Password :admin
        and then i have changed my password from user management in 
workplace.
after that I add a new admin for my partner and a new Project manager.
        I told my partner the username& password.At first time login it's ok 
but later it showed system error>>>from URL 
http://localhost/opencms/opencms/system/login/index.html?login=true


error >>>>like this....
com.opencms.core.CmsException: 10 Unknown User. Detailed error: [OpenCms 
login failed].
	at com.opencms.workplace.CmsLoginNew.getContent(CmsLoginNew.java:150)
	at 
com.opencms.template.cache.CmsElementXml.getContent(CmsElementXml.java:171)
	at com.opencms.template.cache.CmsUri.callCanonicalRoot(CmsUri.java:185)
	at 
com.opencms.template.cache.CmsElementCache.callCanonicalRoot(CmsElementCache.java:149)
	at 
com.opencms.launcher.CmsXmlLauncher.generateOutput(CmsXmlLauncher.java:285)
	at com.opencms.launcher.CmsXmlLauncher.launch(CmsXmlLauncher.java:341)
	at com.opencms.launcher.A_CmsLauncher.initlaunch(A_CmsLauncher.java:274)
	at com.opencms.core.OpenCms.showResource(OpenCms.java:961)
	at com.opencms.core.OpenCmsHttpServlet.doGet(OpenCmsHttpServlet.java:310)
	at com.opencms.core.OpenCmsHttpServlet.doPost(OpenCmsHttpServlet.java:331)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
	at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
	at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
	at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
	at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
	at 
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
	at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
	at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
	at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
	at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
	at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
	at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
	at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
	at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
	at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
	at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
	at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
	at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
	at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
	at 
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
	at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
	at java.lang.Thread.run(Thread.java:534)

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