why Business card design rejected

I have submitted a Business Card. And received an email which said that

“Thank you for your submission. We have completed our review of “Business Card” and unfortunately we found it isn’t at the quality standard required to move forward, and you won’t be able to re-submit this item again.”

But I don’t understood the reason. Would any one can help me to submit a proper business card design? and feedback about the design?

i.e : The business card I have submitted is a single side design.