Debugging requires the DEBUG CONNECT SESSION system privilege

Error : Issue with Debugging using PL/SQL Developer

ORA - 0131: Insufficient privilegesNote: Debugging requires the DEBUG CONNECT SESSION system privilege

Solution : 

grant DEBUG CONNECT SESSION to  <user_name> ;

grant DEBUG ANY PROCEDURE to <user_name>  ;

Ex User is apps :

SQL> grant DEBUG CONNECT SESSION to apps;

Grant succeeded.

SQL> grant DEBUG ANY PROCEDURE to apps;

Grant succeeded.

SQL> exit: