Invalid token when POSTING Json data

[Milanw2]

I'm getting this error when I'm uploading users:

<?xml version="1.0" encoding="UTF-8" ?>
<EXCEPTION class="moodle_exception">
<ERRORCODE>invalidtoken</ERRORCODE>
<MESSAGE>Invalid token - token not found</MESSAGE>
</EXCEPTION>

And this is my code:

function send_users_to_moodle(client, Json, count, x) {
    client.call({
        wsfunction: "core_user_create_users",
        method: "POST",
        args: {
            Json
        }
    }).then(function (info) {
        console.log(info);
    });
};

[Milanw2]

This happens when I'm trying to add more then 200+- users and when there are errors in the data, like null. But it doesn't give me an error about that, but about the invalid token. Please help. thanks in advance

[mudrd8mz]

Are you able to monitor the server side too? To see if/what error was thrown in Moodle?