It's wrong. You can't use the present perfect here. "My dream" refers to what happened last night, and is a finished time period.
I saw you in my dream.
I had a dream about you.
I dreamed about you.
2013年6月24日
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You can also say: I dreamt about you.
2013年6月24日
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Yes that's correct. We would normally say something like "I dreamt that I saw you in my dream last night."