"FATAL: role "postgres" does not exist" after recover

I am using database Postgresql 9.0.1.

For some reasons, my database was crashed.
At first I found:
DETAIL: The database cluster was initialized with PG_CONTROL_VERSION 0, but
the server was compiled with PG_CONTROL_VERSION 903.

I solved it by copying pg_control from a new cluster

Then I got,
FATAL: could not open directory "pg_notify": Not a directory

Same thing I did here.

Now the db is up. But I can't connect to the db.
It says,
FATAL: role "postgres" does not exist

No roles in the db.
When I use createuser it says the same.

Any idea please.