how to generate a materialised view in parallel by 2 users

We have the below issue:

    

We have a materialised view, this materialised view can be accessed by several users, running a report.
Note that each time we run the report this materialised view is destroyed\regenerated.
The first user generates the materialised view with the correct results but if at the same time a second user decides to run the report, then this user gets the below error msg:

    

ORA-00942 ‘The table or view does not exist’

    

Please advise if there is a workaround to avoid this problem.

    

DB Version: 11.2.0.4

    

Thanks in advance.