After you file

i got the code 151 do anyone think it cause i didnt know i had to put my 1099mis in for the last yr cause there nothing taken out an i only work 6 days an they just deposit 325 in my bank ever month so could it be i own some taxes my depentents are just my son he 29 an my girlfriend she 62 an her brother who been helping he 52 an his child that 11 but we been putting the same for years so can anyone tell me what you think we need our money we pay lot of things off with that we have never had a issue before..