X_CHANNEL_DECLARATION_INVALID

a channel() declaration cannot route its rows

a channel(name, { … }) declaration the cause names is refused. At declaration: a name outside the topic-segment charset, a param listed twice, a records entity that is not an entity() declaration, or a param that is not a column of every listed entity, so its rows would match no topic. At serve time: two declarations sharing one name (a channel name is its topic prefix), or an events publish on a channel declared without events: true

edit the channel('<name>', …) declaration as the cause says. The cause and fix name the exact option