Why is this a blunder?

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davidtio
I am chess beginner and trying to analyze my move using chess.com game review. My queen move was to prepare for checkmating at black king side. I can't figure out why it was flag as blunder. Did I miss something really obvious?
IMKeto

You didn't post the game or position in question.

davidtio

 

Sorry for the missing image earlier. Trying to do it from phone and I can't seem to find the option to include image. My Queen move to d1 was flagged as blunder. 

 

The only thing that I can see is g6 would stop my mate idea, but surely it is more like inaccuracy instead of blunder ?

IMKeto

 

davidtio

Thank you for the input. Now I see it. I can just use my bishop to take h7 pawn first and whatever is the response I can move the queen to position later to checkmate. Thank you IMKeto.

IMKeto

Glad to help.