ORA-31694: master table "SYSTEM"."SYS_IMPORT_SCHEMA_01" failed to load/unlo

Question

Need help... I am importing production export file by schema to QA using this command:
set oracle_sid=qadb
impdp system/manager DIRECTORY=DATAEXP PARALLEL=10 DUMPFILE=exp_prod_01.dmp,exp_prod_02.dmp,exp_prod_03.dmp,exp_prod_04.dmp,exp_prod_05.dmp,exp_prod_06.dmp,exp_prod_07.dmp,exp_prod_08.dmp,exp_prod_09.dmp,exp_prod_10.dmp schemas=qaschema logfile=imp.log exclude=statistics
here is the error shown on the imp.log
ORA-31694: master table "SYSTEM"."SYS_IMPORT_SCHEMA_01" failed to load/unload
ORA-02354: error in exporting/importing data
ORA-39774: parse of metadata stream failed with the following error:
LPX-00231: invalid character 47 ('/') found in a Name or Nmtoke

Answer 1

SQL> select comp_name, status from dba_registry where status='INVALID';
no rows selected
SQL> select object_type,object_name,count(*) from dba_objects where status='INVA
LID' and owner like '%SYS%';
select object_type,object_name,count(*) from dba_objects where status='INVALID'
and owner like '%SYS%'
ERROR at line 1:
ORA-00937: not a single-group group function
SQL>