RPT - RQM adapter (test assets is not found)

hi all,

i have issue to integrated RQM with RPT test

environment:
RQM 3.0.1
RPT 8.2.1.1

log connected to server:
Adapter is successfully connected to the server.

log error load project path:
java.lang.Throwable: org.eclipse.core.internal.resources.ResourceException: Resource '/VPLogin' is not open.
at org.eclipse.core.internal.resources.Project.checkAccessible(Project.java:137)
at org.eclipse.core.internal.resources.Container.members(Container.java:265)
at org.eclipse.core.internal.resources.Container.members(Container.java:248)
at com.ibm.rational.test.lt.rqm.adapter.assets.IFileFinder.findMembers(IFileFinder.java:50)
at com.ibm.rational.test.lt.rqm.adapter.assets.ImportRPTTestsuites.getRPTTestsuites(ImportRPTTestsuites.java:92)
at com.ibm.rational.test.lt.rqm.adapter.execution.RPTProcessor.processImport(RPTProcessor.java:433)
at com.ibm.rqm.adapter.library.data.AbstractProcessor.processTask(AbstractProcessor.java:89)
at com.ibm.rqm.adapter.library.data.AbstractProcessor.processTasks(AbstractProcessor.java:70)
at com.ibm.rqm.adapter.library.data.RQMAdapter.runLoop(RQMAdapter.java:168)
at com.ibm.rqm.adapter.library.data.RQMAdapter$1.run(RQMAdapter.java:74)
at java.lang.Thread.run(Thread.java:736)

this error like the directory project path is not open.
how to open the project path? or give me suggestion to solved this issue?

thanks in advance