Because it is such a complicated question, I'm going to focus on the language at hand. An important word here is "expecting" because it implies that happiness is a state of normalcy. To some extent, the fields of psychology and psychiatry suggest this, though that's a tangent for another thread.
Suffice it to say that I don't think the expectation of happiness prohibits it. I have a difficult time participating in the oft-quoted practice of "Don't expect ________, then when you get it you'll be pleased, but not disappointed when you don't." Your question seems to me to be a logical extension of that, i.e. not getting what you expect is disappointing. I think that both phrasings of it focus too much on the expecting and not enough on the acquisition (or lack thereof) of happiness.
It might also be worthwhile to consider what are realistic expectations in regard to happiness. However, I personally believe that some unrealistic expectations are both healthy and worthwhile.
Regards.
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