Hey @supriya.
Seems like you have not set the properties for the current user. To solve this error, add current user in core-site.xml file (path is $HADOOP_HOME/conf/core-site.xml).
Append the file with the following entry:
<property>
<name>hadoop.proxyuser.current_user.groups</name>
<value>*</value>
</property>
<property>
<name>hadoop.proxyuser.current_user.hosts</name>
<value>*</value>
</property>
Replace "current_user" in the above text with your username.
If you want to set these properties for a particular group or server, replace * with group name and server name respectively:
<property>
<name>hadoop.proxyuser.current_user.groups</name>
<value>name_of_your_group</value>
</property>
<property>
<name>hadoop.proxyuser.current_user.hosts</name>
<value>name_of_your_server</value>
</property>