vector and deque

what is wrong with this code:

ContoursAX, ContoursAY vectors of double

NewLeftPointsX,NewLeftPointsY deques of double

ContoursAX.insert( ContoursAX.end(), NewLeftPointsX.begin(),
NewLeftPointsX.end() );
ContoursAY.insert( ContoursAY.end(), NewLeftPointsY.begin(),
NewLeftPointsY.end() );

.

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