Hue notebook Session 'xxx' not found." (error 404)

After we setup livy server with hue notebook, developers were able to run and save pyspark codes through hue notebook, however couldn't able to rerun the codes after they re-login with new session.

while troubleshooting we found that, hue is deleting the sessions once  users are logged-off

127.0.0.1 - - [06/Nov/2017:16:14:25 +0000] "GET /sessions/3 HTTP/1.1" 200 -
127.0.0.1 - - [06/Nov/2017:16:14:26 +0000] "GET /sessions/3 HTTP/1.1" 200 -
127.0.0.1 - - [06/Nov/2017:16:14:31 +0000] "POST /sessions/3/statements HTTP/1.1" 201 -
127.0.0.1 - - [06/Nov/2017:16:14:31 +0000] "GET /sessions/3/statements/0 HTTP/1.1" 200 -
127.0.0.1 - - [06/Nov/2017:16:14:31 +0000] "GET /sessions/3/log?from=0 HTTP/1.1" 200 -
127.0.0.1 - - [06/Nov/2017:16:25:46 +0000] "DELETE /sessions/3 HTTP/1.1" 200 -

So how to open the previously saved notebook sessions?

Solution is very simple:

Go to the notebook  --> open the saved session --> then click on below highlighted 

then click recreate, now you should be able to re-run the code.