Oracle Solution for Error ora-14405

ORA-14405: partitioned index contains partitions in a different tablespace

What triggered the Error:

An attempt was made to drop a tablespace which contains indexes whose partitions are not completely contained in this tablespace, and which are defined on the tables which are completely contained in this tablespace.

What should we do to fix it:

find indexes with partitions 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.