It seems to be a problem with your SEF component. Don't know why but it seems that uddeim/3002 is translated into something different.
Following code generates the message (removed unnecessary lines):
[code:1] $displaymessages = uddeIMselectInboxMessage($myself, $messageid, $config, 0);
if (count($displaymessages)<1) {
echo _UDDEIM_MESSAGENOACCESS;
return;
}[/code:1]
and
[code:1]function uddeIMselectInboxMessage($myself, $messageid, $config, $trashed=-1) {
// $trashed is zero in your case, so it evaluates to
$sql = "SELECT a.*, b.name AS fromname FROM #__uddeim AS a LEFT JOIN #__users AS b ON a.fromid=b.id WHERE a.toid=".(int)$myself." AND a.id=".(int)$messageid." AND a.totrash=0";
$database->setQuery($sql);
$value = $database->loadObjectList();
if (!$value)
$value = Array();
return $value;
}[/code:1]
"$messageid" is fine and selects the correct message (3002). The function return the message if toid is 159 (this should be your user) and totrash is 0 (it definitely is). So the only possibility to create this error is to pass an invalid "$messageid" to this function in the URL.
Please turn 3rd party SEF off completly (when your SEF component allows to switch SEF off for a certain component you can try this), clear the Joomla cache and try again (it works fine with Joomla SEF).
uddeIM & uddePF Development
CB Language Workgroup
CB 3rd Party Developer
