pg_restore tells schema “test” already exists but it isn't actually - Mailing list pgsql-general

When restoring a dump like this:

pg_restore --clean --create --exit-on-error --dbname=test test.tar

these error messages got printed out:

pg_restore: [archiver (db)] Error while PROCESSING TOC:
pg_restore: [archiver (db)] Error from TOC entry 21; 2615 80924 SCHEMA test test
pg_restore: [archiver (db)] could not execute query: ERROR:  schema "test" already exists
Command was: CREATE SCHEMA test;

but when:

select schema_name from information_schema.schemata;

these got printed out

schema_name     
--------------------
pg_toast
pg_temp_1
pg_toast_temp_1
pg_catalog
public
information_schema

It seems like schema "test" doesn't exist yet,why do I got this kind of error?