Mistake in National Anthem in Eden Garden, Shafqat apologized

Pakistani singer Shafqat Amanat Ali Khan has apologized from nation  during the singing National Anthem ahead Pak-India  match in Eden Garden.
However  Shafqat said while in a message on twitter at social website that  it seemed that mistake happened due to technical  and audio  fault, otherwise who could make mistakes in Anthem. He regretted while saying this i could  not win people heart.