Getting error on opening sample reports

Whenver I am try to open sample report or dashbaord from a Sample folder present inside the application I am getting an error Error: SQLException: HikariDataSource HikariDataSource (hikari_mysql_1) has been closed.
How to open these reports ? Is this a datasource connection error ?

Hi Somen,
Just log in as hdiadmin or superuser and delete the cache datasource.