java.lang.RuntimeException: Configuration cannot evaluate key alluxio.worker.tieredstore.levels as integer

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setting up alluxio.worker.tieredstore.levels=2 is giving me parsing exception

Configuration cannot evaluate key alluxio.worker.tieredstore.levels as integer

java.lang.RuntimeException: Configuration cannot evaluate key  alluxio.worker.tieredstore.levels as integer	at alluxio.Configuration.getInt(Configuration.java:242)	at alluxio.StorageTierAssoc.<init>(StorageTierAssoc.java:43)	at alluxio.WorkerStorageTierAssoc.<init>(WorkerStorageTierAssoc.java:28)	at alluxio.worker.block.BlockWorkerClientServiceHandler.<init>(BlockWorkerClientServiceHandler.java:57)	at alluxio.worker.block.BlockWorker.<init>(BlockWorker.java:133)	at alluxio.worker.AlluxioWorker.<init>(AlluxioWorker.java:157)	at alluxio.worker.AlluxioWorker.get(AlluxioWorker.java:104)	at alluxio.worker.AlluxioWorker.main(AlluxioWorker.java:82)