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How to implement subquery

How to exercise the below query in query builder?

SELECT * FROM `user` WHERE uid=1311 and Qid NOT IN (SELECT Qid FROM subm WHERE uid='1311' and Sid='5721');

I tried this,
$this->user->where('uid', '1311')->whereNotIn('Qid', $this->subm->select('Qid')->where('uid', '1311')->where('Sid','5721')->find())->find();

But it throws this,
Array to string conversion

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