Hdfs and Hive Querying from dremio

When I am trying to query hive and hdfs in dremio .I am getting Impersonate error.
Error:User: dremio is not allowed to impersonate admin
Pls help .

It appears that you have not set up impersonation correctly for those sources.

Please review this tutorial: How to set up HDFS and HIVE Impersonation

Also this documentation for Hive and HDFS