Hi,
I had the same error.
I brutally killed hiveserver in ssh console (didn’t respond to kill) :
ps -ef | grep HiveServer2
kill -9 <pid>
Then go back to Ambari and start Hive.
Wait some minutes for the service to start
Go back to Hue and HCatalog should be working again. (you can have an error ‘cann’t connect to port 10000’ during startup)