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ORA-03221:

Temporary tablespaces and temporary segments must have standard block size
Cause: An attempt was made to do one of the following : (1) create a temporary tablespace with a non-standard block size or, (2) alter an existing permanent tablespace of non-standard block size to a temporary tablespace or, (3) issue a DDL statement that would result in the creation of a temporary segment in a tablespace of non-standard block size.
Action: (1) If creating a temporary tablespace, do not specify a block size different from the standard block size. (2) If altering an existing permanent tablespace to a temporary tablespace, ensure that it is of standard block size. (3) Ensure that the user's temporary tablespace is a tablespace having the standard block size.