This is weak and not authentic

Is this Hadeeth Da’eef ? The hadeeth of making Dua after Salah. Abu Wada’ah (Allah be pleased with him) narrates that the Messenger of Allah (Allah bless him & give him peace) said: “The (optional) prayer of the night should be performed in sets of two Rak’ats, meaning you recite the Tashahhud after every two Rak’ah, express devotion and humility in your supplication, raise your hands and say: “O Allah, forgive me”. Whosoever fails to do so, his prayer will be incomplete.” (Sunan Abu Dawud, 2/40 & Sunan Ibn Majah, 1/419)

Prayer | March 24, 2014 5:32 pm
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I think , well im almost sure , that i have crossed someone when he was praying in the mosque , i heard its a great sin to do so , but if someone does so , will his prayers not be accepted or what ?i think that i heard that , one’s prayer would not be accepted or valid until forty people cross when i pray or something like that , im not sure .. ? can you explain ?

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Sheikh, I m afraid to pray in night and at fajr and I always miss salatul fajr.What should I do,I m sinful as I m afraid?