Just to add another possibility in case this issue is encountered - this can occur if the underlying HDFS cluster is in a compromised state. Check and possibly restart the HDFS cluster. It's not very clear from the error message but I experienced this. 2 VMs had failed and restarted. I had started the LASR server again but didn't think to check HDFS, and it turned out 2 datanodes were also down. Restarting HDFS fixed it.
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