Wodrpess 4.0 Invalid second parameter.

[philJohnson]

I'm having an issue connecting posts. "Invalid second parameter." error comes up when I attempt to add a new connection.

I'm running wordpress 4.0 and the latest version of the plugin.

[davemac]

I'm getting the same thing. I have a basic connection connecting two custom post types:

function dmc_connection_types() {
    p2p_register_connection_type( array(
        'name' => 'note_to_policy',
        'from' => 'dmc-edguide',
        'to' => 'dmc-edpol'
    ) );
}
add_action( 'p2p_init', 'dmc_connection_types' );

If I connect a dmc-edpol to a dmc-edguide it works fine, however if I try to connect a dmc-edguide to a dmc-edpol I get the 'Invalid second parameter' error window and the posts do not connect.

[davemac]

I've worked it out in my case. I was trying to connect to the exact same post.

Maybe the error message could be clearer?