error when defining a search configuration named "default"

Hi there,
I inherited the support of a database with the ancient tsearch2.

I uses a search configuration named "default"

Now when I try to create such a configuration using:
CREATE TEXT SEARCH CONFIGURATION default (
   PARSER = "default"
);

I get an error:
postgres=# CREATE TEXT SEARCH CONFIGURATION default (
postgres(#   PARSER = "default"
postgres(# );
ERROR:  syntax error at or near "default"
LINE 1: CREATE TEXT SEARCH CONFIGURATION default (
                                                                             ^

how can I create such an configuration?

thanks
robert