unable to use Loop server in an existing Regtest setup

[kri8or]

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Following instructions in https://github.com/lightninglabs/loop/tree/master/regtest, under "Using the Loop server in an existing setup":

I run:

sudo docker run -d \
    --user root \
    -p 11009:11009 \
    -v /home/myuser/.lnd:/root/.lnd \
    lightninglabs/loopserver:latest \
    daemon \
    --maxamt=5000000 \
    --lnd.host=192.168.1.209:10009 \
    --lnd.macaroondir=/root/.lnd/data/chain/bitcoin/regtest \
    --lnd.tlspath=/root/.lnd/tls.cert \
    --bitcoin.zmqpubrawblock=tcp://192.168.1.211:28332 \
    --bitcoin.zmqpubrawtx=tcp://192.168.1.211:28333

and get:

2024-05-28 17:12:02.793 [INF] SRVR: Starting loop server version: 0.9.189-beta, commit: regtest, commit hash: regtest, go version: go1.19.7
2024-05-28 17:12:02.793 [INF] LNDC: Creating lnd connection to 192.168.1.209:10009
2024-05-28 17:12:02.794 [INF] LNDC: Connected to lnd
2024-05-28 17:12:02.798 [INF] LNDC: lnd version: v0.17.5-beta, build tags 'autopilotrpc,signrpc,walletrpc,chainrpc,invoicesrpc,watchtowerrpc,neutrinorpc,monitoring,peersrpc,kvdb_postgres,kvdb_etcd,kvdb_sqlite'
2024-05-28 17:12:02.798 [INF] LNDC: Using network regtest
2024-05-28 17:12:02.798 [INF] SRVR: payments lnd is not set
2024-05-28 17:12:02.798 [INF] SRVR: invoices lnd is not set
error starting postgres unable to init database using '/usr/local/bin/initdb -A password -U embedded -D /root/.loopserver/regtest/.postgres/data --pwfile=/root/.loopserver/regtest/.postgres/pwfile': exit status 1
error starting postgres unable to init database using '/usr/local/bin/initdb -A password -U embedded -D /root/.loopserver/regtest/.postgres/data --pwfile=/root/.loopserver/regtest/.postgres/pwfile': exit status 1
Starting loop server got error: error starting postgres unable to init database using '/usr/local/bin/initdb -A password -U embedded -D /root/.loopserver/regtest/.postgres/data --pwfile=/root/.loopserver/regtest/.postgres/pwfile': exit status 1

am I missing something here?