anyone have experience in making pligg bots?

I am making pligg bot for fun, register is easy but when i try to submit url in first step like here:

readnshout. com /submit.php

I always go the same error after first post submit : "Wrong security code"

<label for="url">Unique News URL:</label>
<input name="url" id="url" value="http://" size="55" type="text">
<input name="phase" value="1" type="hidden">
<input name="randkey" value="1705551" type="hidden">
<input name="id" value="c_1" type="hidden">
<input value="Continue" class="submit-s" type="submit">

Click to expand...

I post this easy form and in post i have all above vars, also with randkey but still got this error. I checked manually post in firebug and cookies nothing special there but still i think i miss something.
Platform is easy like hell but maybe anyone experienced the same problem. In rand key i don't have any spaces etc



edit: lol pligg in these steps checks referef if is set, when set works fine