ORA-23515: materialized views and/or their indices exist in the tablespace

Make list of  MATERIALIZED  view:
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select 'drop materialized view  '|| a.owner||'.'|| a.object_name || ';' from dba_objects a ,dba_segments b where a.OWNER=b.OWNER and b.TABLESPACE_NAME='MGMT_TABLESPACE'  and object_type='MATERIALIZED VIEW';
drop materialized view SYSMAN.MGMT$ARU_PATCH_RECOM_MD;