Can't create a post

Hi, I saw in the console that it fails on:

2020-09-24T15:41:49.651Z]  [@firebase](/firebase)/database: FIREBASE WARNING: set at /posts/67110fcf50 failed: permission_denied 
K @ logger.ts:115
$.warn @ logger.ts:206
lt @ util.ts:180
(anonymous) @ Repo.ts:336
(anonymous) @ PersistentConnection.ts:541
Ei.onDataMessage_ @ PersistentConnection.ts:576
fi.onDataMessage_ @ Connection.ts:322
fi.onPrimaryMessageReceived_ @ Connection.ts:314
(anonymous) @ Connection.ts:210
ui.appendFrame_ @ WebSocketConnection.ts:286
ui.handleIncomingFrame @ WebSocketConnection.ts:341
mySock.onmessage @ WebSocketConnection.ts:205
Repo.ts:632 Uncaught (in promise) Error: PERMISSION_DENIED: Permission denied
    at Repo.ts:632
    at Dt (util.ts:588)
    at Ni.callOnCompleteCallback (Repo.ts:622)
    at Repo.ts:344
    at PersistentConnection.ts:541
    at Ei.onDataMessage_ (PersistentConnection.ts:576)
    at fi.onDataMessage_ (Connection.ts:322)
    at fi.onPrimaryMessageReceived_ (Connection.ts:314)
    at ui.onMessage (Connection.ts:210)
    at ui.appendFrame_ (WebSocketConnection.ts:286)

Any idea on how to unblock this?