Startup error

[mpope9]

While running this for the first time I see the following:

[error] GenServer :mnesia_rocksdb_admin terminating
** (FunctionClauseError) no function clause matching in :mnesia_rocksdb_admin.map_cfs/4
    (mnesia_rocksdb 0.0.0+build.95.ref296813e) /Users/user/project/deps/mnesia_rocksdb/src/mnesia_rocksdb_admin.erl:1542: :mnesia_rocksdb_admin.map_cfs({:error, {:db_open, ~c"IO error: No such file or directory: While mkdir if missing: /Users/user/project/Mnesia.nonode@nohost/mnesia_rocksdb-rocksdb_copies-_db.extrdb: No such file or directory"}}, [{~c"default", [merge_operator: :erlang_merge_operator]}, {~c"{a,rocksdb_copies}", [merge_operator: :erlang_merge_operator]}], :rocksdb_copies, %{mountpoint: ~c"/Users/user/project/Mnesia.nonode@nohost/mnesia_rocksdb-rocksdb_copies-_db.extrdb"})

I had to run a mkdir "Mnesia.nonode@nohost" first. This is on Mac with Intel. Here is the repro:

:mnesia.create_schema([node()])
:ok = :mnesia.start()
{:ok, :rocksdb_copies} = :mnesia_rocksdb.register()