Error when searching Flagged Messages

[oriolfuentes]

Hello,

I 'm trying to fetch flagged mails from a specified folder.
I tried:
$folder->query()->not()->unflagged()->setFetchBody(false)->leaveUnread()->get();
$folder->query()->not()->where([["UNFLAGGED"]])->leaveUnread()->get();

And some other I don't have now.

It throws me this reponse:
Too few arguments to function Webklex\PHPIMAP\Query\WhereQuery::where(), 0 passed and at least 1 expected

Also tried:

$folder->query()->flagged('Flagged')->setFetchBody(false)->leaveUnread()->get();

This throws me:
Webklex \PHPIMAP\ Exceptions\ImapServerErrorException

I also tried:
$aMessage = $folder->query()->seen()->setFetchBody(false)->leaveUnread()->get();
$aMessage = $folder->query()->unseen()->setFetchBody(false)->leaveUnread()->get();
$aMessage = $folder->query()->unflagged()->setFetchBody(false)->leaveUnread()->get();
$aMessage = $folder->query()->whereAll()->setFetchBody(false)->leaveUnread()->get();

And they work perfectly.

Any ideas why I can not retrive flagged messages or where is my error?

Thanks in advance.

Oriol

PS: I also opened the same question on php-imap, but i didn't had any responses for more than a week, so i am trying here. Sorry if this is not the correct way