Exception in finding Unresollved using plain java api?

Hello,

I am trying to find out all the Unresolved changes of the loaded workspace(Loaded with the help of load file)
Code:
 
         ISharingManager sm = FileSystemCore.getSharingManager();

         ILocalChangeManager lcm = sm.getLocalChangeManager();
         
      
         String target = "HWRef";

         PathLocation pathlocation = new PathLocation(projectConfiguration.getSandBoxLocation() );

         ILocation sandBoxLocation = pathlocation.getCanonicalForm();

         String[] targetPaths = target.split("/");

         ISandbox sbox = sm.getSandbox(sandBoxLocation, false);
         System.out.println(sbox.getRoot());
         
         IShare[] sss= sbox.allShares(null);
     
          IRelativeLocation relativeLocation = new RelativeLocation(Arrays.asList(targetPaths));
          IShareable shareable = sbox.findShareable(relativeLocation, ResourceType.FOLDER);
          lcm.refreshChanges(new ISandbox[] { sbox },RefreshType.TRAVERSE_ALL_WITH_RECOMPUTE_OF_KNOWN, null);
          
           ILocalChange[] localChanges = lcm.getPendingChanges(new IShareable[] { shareable }, null);
        
In the localChanges  it was showing as:
"org.eclipse.debug.core.DebugException: com.sun.jdi.ClassNotLoadedException: Type has not been loaded occurred while retrieving component type of array."
 
i have used another method of localChanges but got same message.
 IShare[] shares= sbox.allShares(null);
 ILocalChange[] localChanges1 =  lcm.getPendingChanges(shares);

Thanks in advance!!