Message Oracle ORA-39212 - installation error: XSL stylesheets not loaded correctly

ERRORinstallation error: XSL stylesheets not loaded correctly
CAUSEThe XSL stylesheets used by the Data Pump Metadata API were not loaded correctly into the Oracle dictionary table sys.metastylesheet. Either the stylesheets were not loaded at all, or they were not converted to the database character set.
ACTIONConnect AS SYSDBA and execute dbms_metadata_util.load_stylesheets to reload the stylesheets.