Error when running expdp - ORA-39126: Worker unexpected fatal error

When running full export using expdp I am getting the following error:

ORA-39126: Worker unexpected fatal error in KUPW$WORKER.FETCH_XML_OBJECTS []
ORA-31642: the following SQL statement fails:
BEGIN "SYS"."DBMS_CUBE_EXP".SCHEMA_CALLOUT(:1,0,1,'11.01.00.00.00'); END;
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86
ORA-06512: at "SYS.DBMS_METADATA", line 1749
ORA-04063: package body "SYS.DBMS_CUBE_EXP" has errors
ORA-06508: PL/SQL: could not find program unit being called: "SYS.DBMS_CUBE_EXP"

ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86
ORA-06512: at "SYS.KUPW$WORKER", line 8996

What could be the problem?