The following is the ORA-14408 error message, you can learn the cause and solution of the Oracle database error.
ORA-14408 partitioned index contains subpartitions in a different tablespace
Cause: An attempt was made to drop a tablespace which contains indexes whose subpartitions are not completely contained in this tablespace, and which are defined on the tables which are completely contained in this tablespace.
Solution: Find indexes with subpartitions which span the tablespace being dropped and some other tablespace(s). Drop these indexes, or move the index partitions to a different tablespace, or find the tables on which the indexes are defined, and drop (or move) them.
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