Drop Schema Error

Hello!

I’m trying to:
DROP SCHEMA “_old_permissions”;

And I get this error:

ERROR: cannot drop schema _old_permissions because other objects depend on it

DETAIL:  function 17059 depends on schema _old_permissions

function 17060 depends on schema _old_permissions

HINT: Use DROP … CASCADE to drop the dependant objects too.

So, naturally I:

DROP SCHEMA “_old_permissions” CASCADE;

Which produces:

NOTICE:  drop cascades to 2 other objects

DETAIL:  drop cascades to function 17059

drop cascades to function 17060

[Err] ERROR:  cache lookup failed for function 17060

What is this trying to tell me?