error in searchva

HI all.

things are going bad!!!

Error
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is: java.rmi.RemoteException: (kablink) Could not open index writer; nested exception is: org.apache.lucene.store.LockReleaseFailedException : Cannot forcefully unlock a NativeFSLock which is held by another indexer component: /vastorage/search/kablink/write.lock

what an admin must do?