ORA-28014: cannot drop administrative users

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While dropping APEX user got below error in oracle 12c, got below error.

SQL> drop user APEX_050000 cascade;
drop user APEX_050000 cascade
*
ERROR at line 1:
ORA-28014: cannot drop administrative users

set _oracle_script to TRUE and execute drop command as below.

SQL> alter session set “_oracle_script“=true;

Session altered

SQL> drop user APEX_050000 cascade;

User dropped.