I am trying to connect to a server with node-opcua, but having a bit of trouble.

Connecting to the same server with the Prosys OPC UA Browser software works just fine.

const client = OPCUAClient.create({
    endpointMustExist: false,
    securityMode: MessageSecurityMode.SignAndEncrypt,
    securityPolicy: SecurityPolicy.Basic256Sha256
});

await client.connect(endpointUrl);

const session = await client.createSession({
        userName: data.userName,
        password: data.password,

    },
    function(err) {
        console.log(err)
    }
);

It connects, but I am getting the error: 'Error: Invalid channel' and it immediatley disconnects.

What does this mean?