How to fix error ORA-04063: package body "OLAPSYS.CWM2_OLAP_METADATA_REFRESH" has errors when installing OLAP into a 11g database

You are installing OLAP.
You receive the following error at the end of the olap.sql script:

SQL> @?/olap/admin/olap.sql SYSAUX TEMP;

SQL> execute cwm2_olap_metadata_refresh.mr_refresh;
BEGIN cwm2_olap_metadata_refresh.mr_refresh; END;

*
ERROR at line 1:
ORA-04063: package body "OLAPSYS.CWM2_OLAP_METADATA_REFRESH" has errors
ORA-06508: PL/SQL: could not find program unit being called:
"OLAPSYS.CWM2_OLAP_METADATA_REFRESH"
ORA-06512: at line 1

Solution:
Drop the OLAPSYS user and rerun the script:

$ sqlplus '/ as sysdba'
SQL> drop user OLAPSYS cascade
SQL> @?/olap/admin/olap.sql SYSAUX TEMP;
SQL> @?/rdbms/admin/utlrp.sql

Sources: Doc ID 726253.1 "Errors: ORA-04063, ORA-06508, ORA-06512 When Adding OLAP Using the Script 'olap.sql SYSAUX TEMP;'"